chg: [connection] put sync callback in threads

Author: gallypette

realtime/connection.py

@@ -79,7 +79,7 @@ async def _run_callback_safe(self, callback: Callback, payload: Dict) -> None:
             if asyncio.iscoroutinefunction(callback):
                 asyncio.create_task(callback(payload))
             else:
-                callback(payload)
+                asyncio.create_task(asyncio.to_thread(callback, payload))
         except Exception as e:
             raise CallbackError("Error in callback") from e