fix: [Orchestration] Hide constructors for System- and UserMessage (#334)

* Hide constructors for System- and UserMessage

* Update release_notes

---------

Co-authored-by: Jonas Israel <[email protected]>

Author: Jonas-Isr

docs/release-notes/release_notes.md

@@ -8,7 +8,7 @@
 
 ### 🔧 Compatibility Notes
 
--
+- The constructors `UserMessage(MessageContent)` and `SystemMessage(MessageContent)` are removed. Use `Message.user(String)`, `Message.user(ImageItem)`, or `Message.system(String)` instead.
 
 ### ✨ New Functionality
 

orchestration/src/main/java/com/sap/ai/sdk/orchestration/SystemMessage.java

@@ -4,14 +4,17 @@
 import java.util.LinkedList;
 import java.util.List;
 import javax.annotation.Nonnull;
+import lombok.AccessLevel;
 import lombok.Getter;
+import lombok.RequiredArgsConstructor;
 import lombok.Value;
 import lombok.experimental.Accessors;
 import lombok.experimental.Tolerate;
 
 /** Represents a chat message as 'system' to the orchestration service. */
 @Value
 @Accessors(fluent = true)
+@RequiredArgsConstructor(access = AccessLevel.PACKAGE)
 public class SystemMessage implements Message {
 
   /** The role of the assistant. */

orchestration/src/main/java/com/sap/ai/sdk/orchestration/UserMessage.java

@@ -4,14 +4,17 @@
 import java.util.LinkedList;
 import java.util.List;
 import javax.annotation.Nonnull;
+import lombok.AccessLevel;
 import lombok.Getter;
+import lombok.RequiredArgsConstructor;
 import lombok.Value;
 import lombok.experimental.Accessors;
 import lombok.experimental.Tolerate;
 
 /** Represents a chat message as 'user' to the orchestration service. */
 @Value
 @Accessors(fluent = true)
+@RequiredArgsConstructor(access = AccessLevel.PACKAGE)
 public class UserMessage implements Message {
 
   /** The role of the assistant. */