feat: Add support for realtime-events in copilot-threads and copilot-messages (#11557)

- Add API support for creating a thread
- Add API support for creating a message
- Remove uuid from thread (no longer required, we will use existing
websocket connection to send messages)
- Update message_type to a column (user, assistant, assistant_thinking)

app/listeners/action_cable_listener.rb

@@ -204,3 +204,5 @@ class ActionCableListener < BaseListener
     ::ActionCableBroadcastJob.perform_later(tokens.uniq, event_name, payload)
   end
 end
+
+ActionCableListener.prepend_mod_with('ActionCableListener')