ReplyOnPause and ReplyOnStopWords can be interrupted (#119)

* Add all this code

* add code

* Fix demo

---------

Co-authored-by: Freddy Boulton <freddyboulton@hf-freddy.local>

backend/fastrtc/websocket.py

@@ -55,6 +55,7 @@ class WebSocketHandler:
         ],
     ):
         self.stream_handler = stream_handler
+        self.stream_handler._clear_queue = lambda: None
         self.websocket: Optional[WebSocket] = None
         self._emit_task: Optional[asyncio.Task] = None
         self.stream_id: Optional[str] = None