Add ReplyOnStopWords (#35)

* add code

* fix dependencies

* add code:

backend/gradio_webrtc/utils.py

@@ -3,7 +3,7 @@ import fractions
 import io
 import logging
 import tempfile
-from typing import Any, Callable, Protocol, cast
+from typing import Any, Callable, Protocol, TypedDict, cast
 
 import av
 import numpy as np
@@ -15,6 +15,11 @@ logger = logging.getLogger(__name__)
 AUDIO_PTIME = 0.020
 
 
+class AudioChunk(TypedDict):
+    start: int
+    end: int
+
+
 class AdditionalOutputs:
     def __init__(self, *args) -> None:
         self.args = args