Add new streaming classes for C#

Signed-off-by: Travis Angevine <[email protected]>

Author: trangevi

specification/ai/ModelClient/client.tsp

@@ -54,10 +54,10 @@ namespace Customizations; // The actual name here doesn't matter and is here for
 @@access(AI.Model.ChatMessageImageContentItem, Access.public);
 @@access(AI.Model.ChatMessageImageUrl, Access.public);
 @@access(AI.Model.ChatMessageImageDetailLevel, Access.public);
-@@access(AI.Model.StreamingChatCompletionsUpdate, Access.public, "python");
-@@access(AI.Model.StreamingChatChoiceUpdate, Access.public, "python");
-@@access(AI.Model.StreamingChatResponseMessageUpdate, Access.public, "python");
-@@access(AI.Model.StreamingChatResponseToolCallUpdate, Access.public, "python");
+@@access(AI.Model.StreamingChatCompletionsUpdate, Access.public, "python,csharp");
+@@access(AI.Model.StreamingChatChoiceUpdate, Access.public, "python,csharp");
+@@access(AI.Model.StreamingChatResponseMessageUpdate, Access.public, "python,csharp");
+@@access(AI.Model.StreamingChatResponseToolCallUpdate, Access.public, "python,csharp");
 
 // The operators need to be hidden, since we hand-write the public versions of those to
 // 1. Add chat completions streaming (to getChatCompletions operator)