Add Identifiable conformance to PartiallyGenerated struct in GenerableMacro (#73)

* Add Identifiable conformance to `PartiallyGenerated` struct in `GenerableMacro`

* Add generation ID to GeneratedContent initialization in tests

Author: ethanhuang13

Sources/AnyLanguageModelMacros/GenerableMacro.swift

@@ -690,12 +690,15 @@ public struct GenerableMacro: MemberMacro, ExtensionMacro {
 
         return DeclSyntax(
             stringLiteral: """
-                public struct PartiallyGenerated: Sendable, ConvertibleFromGeneratedContent {
+                public struct PartiallyGenerated: Identifiable, Sendable, ConvertibleFromGeneratedContent {
+                    public var id: GenerationID
+
                     \(optionalProperties)
 
                     private let rawContent: GeneratedContent
 
                     public init(_ generatedContent: GeneratedContent) throws {
+                        self.id = generatedContent.id ?? GenerationID()
                         self.rawContent = generatedContent
 
                         if \(properties.isEmpty ? "case .structure = generatedContent.kind" : "case .structure(let properties, _) = generatedContent.kind") {

Tests/AnyLanguageModelTests/GenerableMacroTests.swift

@@ -126,13 +126,18 @@ struct GenerableMacroTests {
 
     @Test("Create instance from GeneratedContent")
     func fromGeneratedContent() throws {
-        let content = GeneratedContent(properties: [
-            "name": GeneratedContent("Bob"),
-            "age": GeneratedContent(kind: .number(25)),
-        ])
+        let generationID = GenerationID()
+        let content = GeneratedContent(
+            properties: [
+                "name": GeneratedContent("Bob"),
+                "age": GeneratedContent(kind: .number(25)),
+            ],
+            id: generationID
+        )
 
         let args = try TestArguments(content)
         #expect(args.name == "Bob")
         #expect(args.age == 25)
+        #expect(args.asPartiallyGenerated().id == generationID)
     }
 }