Add ResponseItem constructors (#625)

All the classes derived from `ResponseItem` now have public constructors, and these constructors are generated.

A side effect of making these classes behave as both, inputs and outputs, was that their required properties got setters. Setters make sense when the values of these properties can be updated, but in this particular case they should only be settable at construction time. This is a limitation in the code generator being tracked by the following issue:
🔗 microsoft/typespec#5175 (comment)

Author: joseharriaga

api/OpenAI.net8.0.cs

@@ -4594,10 +4594,21 @@ public enum ComputerCallActionMouseButton {
         Forward = 4
     }
     [Experimental("OPENAICUA001")]
+    public class ComputerCallOutput : IJsonModel<ComputerCallOutput>, IPersistableModel<ComputerCallOutput> {
+        public static ComputerCallOutput CreateScreenshotOutput(BinaryData screenshotImageBytes, string screenshotImageBytesMediaType);
+        public static ComputerCallOutput CreateScreenshotOutput(string screenshotImageFileId);
+        public static ComputerCallOutput CreateScreenshotOutput(Uri screenshotImageUri);
+        protected virtual ComputerCallOutput JsonModelCreateCore(ref Utf8JsonReader reader, ModelReaderWriterOptions options);
+        protected virtual void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWriterOptions options);
+        protected virtual ComputerCallOutput PersistableModelCreateCore(BinaryData data, ModelReaderWriterOptions options);
+        protected virtual BinaryData PersistableModelWriteCore(ModelReaderWriterOptions options);
+    }
+    [Experimental("OPENAICUA001")]
     public class ComputerCallOutputResponseItem : ResponseItem, IJsonModel<ComputerCallOutputResponseItem>, IPersistableModel<ComputerCallOutputResponseItem> {
+        public ComputerCallOutputResponseItem(string callId, ComputerCallOutput output);
         public IList<ComputerCallSafetyCheck> AcknowledgedSafetyChecks { get; }
-        public string CallId { get; }
-        public ComputerOutput Output { get; }
+        public string CallId { get; set; }
+        public ComputerCallOutput Output { get; set; }
         public ComputerCallOutputStatus? Status { get; }
         protected override ResponseItem JsonModelCreateCore(ref Utf8JsonReader reader, ModelReaderWriterOptions options);
         protected override void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWriterOptions options);
@@ -4613,8 +4624,8 @@ public enum ComputerCallOutputStatus {
     [Experimental("OPENAICUA001")]
     public class ComputerCallResponseItem : ResponseItem, IJsonModel<ComputerCallResponseItem>, IPersistableModel<ComputerCallResponseItem> {
         public ComputerCallResponseItem(string callId, ComputerCallAction action, IEnumerable<ComputerCallSafetyCheck> pendingSafetyChecks);
-        public ComputerCallAction Action { get; }
-        public string CallId { get; }
+        public ComputerCallAction Action { get; set; }
+        public string CallId { get; set; }
         public IList<ComputerCallSafetyCheck> PendingSafetyChecks { get; }
         public ComputerCallStatus? Status { get; }
         protected override ResponseItem JsonModelCreateCore(ref Utf8JsonReader reader, ModelReaderWriterOptions options);
@@ -4640,16 +4651,6 @@ public enum ComputerCallStatus {
         Incomplete = 2
     }
     [Experimental("OPENAICUA001")]
-    public class ComputerOutput : IJsonModel<ComputerOutput>, IPersistableModel<ComputerOutput> {
-        public static ComputerOutput CreateScreenshotOutput(BinaryData screenshotImageBytes, string screenshotImageBytesMediaType);
-        public static ComputerOutput CreateScreenshotOutput(string screenshotImageFileId);
-        public static ComputerOutput CreateScreenshotOutput(Uri screenshotImageUri);
-        protected virtual ComputerOutput JsonModelCreateCore(ref Utf8JsonReader reader, ModelReaderWriterOptions options);
-        protected virtual void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWriterOptions options);
-        protected virtual ComputerOutput PersistableModelCreateCore(BinaryData data, ModelReaderWriterOptions options);
-        protected virtual BinaryData PersistableModelWriteCore(ModelReaderWriterOptions options);
-    }
-    [Experimental("OPENAICUA001")]
     public readonly partial struct ComputerToolEnvironment : IEquatable<ComputerToolEnvironment> {
         public ComputerToolEnvironment(string value);
         public static ComputerToolEnvironment Browser { get; }
@@ -4670,8 +4671,9 @@ public class ComputerOutput : IJsonModel<ComputerOutput>, IPersistableModel<Comp
     }
     [Experimental("OPENAI001")]
     public class FileSearchCallResponseItem : ResponseItem, IJsonModel<FileSearchCallResponseItem>, IPersistableModel<FileSearchCallResponseItem> {
+        public FileSearchCallResponseItem(IEnumerable<string> queries);
         public IList<string> Queries { get; }
-        public IList<FileSearchCallResult> Results { get; }
+        public IList<FileSearchCallResult> Results { get; set; }
         public FileSearchCallStatus? Status { get; }
         protected override ResponseItem JsonModelCreateCore(ref Utf8JsonReader reader, ModelReaderWriterOptions options);
         protected override void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWriterOptions options);
@@ -4680,7 +4682,7 @@ public class FileSearchCallResponseItem : ResponseItem, IJsonModel<FileSearchCal
     }
     [Experimental("OPENAI001")]
     public class FileSearchCallResult : IJsonModel<FileSearchCallResult>, IPersistableModel<FileSearchCallResult> {
-        public IReadOnlyDictionary<string, BinaryData> Attributes { get; }
+        public IDictionary<string, BinaryData> Attributes { get; }
         public string FileId { get; set; }
         public string Filename { get; set; }
         public float? Score { get; set; }
@@ -4725,7 +4727,8 @@ public class FileSearchToolRankingOptions : IJsonModel<FileSearchToolRankingOpti
     }
     [Experimental("OPENAI001")]
     public class FunctionCallOutputResponseItem : ResponseItem, IJsonModel<FunctionCallOutputResponseItem>, IPersistableModel<FunctionCallOutputResponseItem> {
-        public string CallId { get; }
+        public FunctionCallOutputResponseItem(string callId, string functionOutput);
+        public string CallId { get; set; }
         public string FunctionOutput { get; set; }
         public FunctionCallOutputStatus? Status { get; }
         protected override ResponseItem JsonModelCreateCore(ref Utf8JsonReader reader, ModelReaderWriterOptions options);
@@ -4741,7 +4744,8 @@ public enum FunctionCallOutputStatus {
     }
     [Experimental("OPENAI001")]
     public class FunctionCallResponseItem : ResponseItem, IJsonModel<FunctionCallResponseItem>, IPersistableModel<FunctionCallResponseItem> {
-        public string CallId { get; }
+        public FunctionCallResponseItem(string callId, string functionName, BinaryData functionArguments);
+        public string CallId { get; set; }
         public BinaryData FunctionArguments { get; set; }
         public string FunctionName { get; set; }
         public FunctionCallStatus? Status { get; }
@@ -4867,9 +4871,9 @@ public static class OpenAIResponsesModelFactory {
     public class ReasoningResponseItem : ResponseItem, IJsonModel<ReasoningResponseItem>, IPersistableModel<ReasoningResponseItem> {
         public ReasoningResponseItem(IEnumerable<ReasoningSummaryPart> summaryParts);
         public ReasoningResponseItem(string summaryText);
-        public string EncryptedContent { get; }
+        public string EncryptedContent { get; set; }
         public ReasoningStatus? Status { get; }
-        public IReadOnlyList<ReasoningSummaryPart> SummaryParts { get; }
+        public IList<ReasoningSummaryPart> SummaryParts { get; }
         public string GetSummaryText();
         protected override ResponseItem JsonModelCreateCore(ref Utf8JsonReader reader, ModelReaderWriterOptions options);
         protected override void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWriterOptions options);
@@ -4884,7 +4888,7 @@ public enum ReasoningStatus {
     }
     [Experimental("OPENAI001")]
     public class ReasoningSummaryPart : IJsonModel<ReasoningSummaryPart>, IPersistableModel<ReasoningSummaryPart> {
-        public static ReasoningSummaryPart CreateTextPart(string text);
+        public static ReasoningSummaryTextPart CreateTextPart(string text);
         protected virtual ReasoningSummaryPart JsonModelCreateCore(ref Utf8JsonReader reader, ModelReaderWriterOptions options);
         protected virtual void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWriterOptions options);
         protected virtual ReasoningSummaryPart PersistableModelCreateCore(BinaryData data, ModelReaderWriterOptions options);
@@ -5072,14 +5076,10 @@ public class ResponseItem : IJsonModel<ResponseItem>, IPersistableModel<Response
         [Experimental("OPENAICUA001")]
         public static ComputerCallResponseItem CreateComputerCallItem(string callId, ComputerCallAction action, IEnumerable<ComputerCallSafetyCheck> pendingSafetyChecks);
         [Experimental("OPENAICUA001")]
-        public static ComputerCallOutputResponseItem CreateComputerCallOutputItem(string callId, IList<ComputerCallSafetyCheck> acknowledgedSafetyChecks, BinaryData screenshotImageBytes, string screenshotImageBytesMediaType);
-        [Experimental("OPENAICUA001")]
-        public static ComputerCallOutputResponseItem CreateComputerCallOutputItem(string callId, IList<ComputerCallSafetyCheck> acknowledgedSafetyChecks, string screenshotImageFileId);
-        [Experimental("OPENAICUA001")]
-        public static ComputerCallOutputResponseItem CreateComputerCallOutputItem(string callId, IList<ComputerCallSafetyCheck> acknowledgedSafetyChecks, Uri screenshotImageUri);
+        public static ComputerCallOutputResponseItem CreateComputerCallOutputItem(string callId, ComputerCallOutput output);
         public static MessageResponseItem CreateDeveloperMessageItem(IEnumerable<ResponseContentPart> contentParts);
         public static MessageResponseItem CreateDeveloperMessageItem(string inputTextContent);
-        public static FileSearchCallResponseItem CreateFileSearchCallItem(IEnumerable<string> queries, IEnumerable<FileSearchCallResult> results);
+        public static FileSearchCallResponseItem CreateFileSearchCallItem(IEnumerable<string> queries);
         public static FunctionCallResponseItem CreateFunctionCallItem(string callId, string functionName, BinaryData functionArguments);
         public static FunctionCallOutputResponseItem CreateFunctionCallOutputItem(string callId, string functionOutput);
         public static ReasoningResponseItem CreateReasoningItem(IEnumerable<ReasoningSummaryPart> summaryParts);
@@ -5551,6 +5551,7 @@ public class StreamingResponseWebSearchCallSearchingUpdate : StreamingResponseUp
     }
     [Experimental("OPENAI001")]
     public class WebSearchCallResponseItem : ResponseItem, IJsonModel<WebSearchCallResponseItem>, IPersistableModel<WebSearchCallResponseItem> {
+        public WebSearchCallResponseItem();
         public WebSearchCallStatus? Status { get; }
         protected override ResponseItem JsonModelCreateCore(ref Utf8JsonReader reader, ModelReaderWriterOptions options);
         protected override void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWriterOptions options);