feat: add chat_stream to app_mention

Author: srtaalej

listeners/events/app_mentioned.py

@@ -34,23 +34,22 @@ def app_mentioned_callback(client: WebClient, event: dict, logger: Logger, say:
 
         returned_message = call_llm([{"role": "user", "content": text}])
 
-        stream_response = client.chat_startStream(
-            channel=channel_id, recipient_team_id=team_id, recipient_user_id=user_id, thread_ts=thread_ts
+        streamer = client.chat_stream(
+            channel=channel_id,
+            recipient_team_id=team_id,
+            recipient_user_id=user_id,
+            thread_ts=thread_ts,
         )
 
-        stream_ts = stream_response["ts"]
-
-        # Loop over OpenAI response stream
-        # https://platform.openai.com/docs/api-reference/responses/create
+        # use of this for loop is specific to openai response method
         for event in returned_message:
             if event.type == "response.output_text.delta":
-                client.chat_appendStream(channel=channel_id, ts=stream_ts, markdown_text=f"{event.delta}")
+                streamer.append(markdown_text=f"{event.delta}")
             else:
                 continue
 
         feedback_block = create_feedback_block()
-        client.chat_stopStream(channel=channel_id, ts=stream_ts, blocks=feedback_block)
-
+        streamer.stop(blocks=feedback_block)
     except Exception as e:
         logger.exception(f"Failed to handle a user message event: {e}")
         say(f":warning: Something went wrong! ({e})")