Regenerate code and add sample for additional messages

sdk/ai/Azure.AI.Projects/src/Custom/Agent/AIClientModelFactory.cs

@@ -193,7 +193,7 @@ public static ThreadMessage ThreadMessage(string id = null, DateTimeOffset creat
         attachments ??= new List<MessageAttachment>();
         metadata ??= new Dictionary<string, string>();
 
-        return new ThreadMessage(id, @object: null, createdAt, threadId, status, incompleteDetails, completedAt, incompleteAt, role, contentItems?.ToList(), agentId, runId, attachments?.ToList(), metadata, serializedAdditionalRawData: null);
+        return new ThreadMessage(id, @object: null, createdAt, threadId, status, incompleteDetails, completedAt, incompleteAt, role, contentItems?.ToList(), agentId, runId, attachments?.ToList(), (IReadOnlyDictionary<string, string>)metadata, serializedAdditionalRawData: null);
     }
 
     public static RequiredFunctionToolCall RequiredFunctionToolCall(string toolCallId, string functionName, string functionArguments)

sdk/ai/Azure.AI.Projects/src/Custom/Agent/AgentsClient.Streaming.cs

@@ -68,7 +68,7 @@ public virtual AsyncCollectionResult<StreamingUpdate> CreateRunStreamingAsync(st
             overrideModelName,
             overrideInstructions,
             additionalInstructions,
-            additionalMessages?.ToList() as IReadOnlyList<ThreadMessage> ?? new ChangeTrackingList<ThreadMessage>(),
+            additionalMessages?.ToList() as IReadOnlyList<ThreadMessageOptions> ?? new ChangeTrackingList<ThreadMessageOptions>(),
             overrideTools?.ToList() as IReadOnlyList<ToolDefinition> ?? new ChangeTrackingList<ToolDefinition>(),
             stream: true,
             temperature,
@@ -142,7 +142,7 @@ public virtual CollectionResult<StreamingUpdate> CreateRunStreaming(string threa
             overrideModelName,
             overrideInstructions,
             additionalInstructions,
-            additionalMessages?.ToList() as IReadOnlyList<ThreadMessage> ?? new ChangeTrackingList<ThreadMessage>(),
+            additionalMessages?.ToList() as IReadOnlyList<ThreadMessageOptions> ?? new ChangeTrackingList<ThreadMessageOptions>(),
             overrideTools?.ToList() as IReadOnlyList<ToolDefinition> ?? new ChangeTrackingList<ToolDefinition>(),
             stream: true,
             temperature,