feat: send audio

AudioSender runs in a separate thread to send audio from the microphone.

ref: N25B-119

src/robot_interface/main.py

@@ -1,4 +1,7 @@
 import logging
+
+from robot_interface.endpoints.audio_sender import AudioSender
+
 logging.basicConfig(level=logging.DEBUG)
 
 import zmq
@@ -25,8 +28,11 @@ def main_loop(context):
 
     video_sender = VideoSender(context)
     state.sockets.append(video_sender)
+    audio_sender = AudioSender(context)
+    state.sockets.append(audio_sender)
 
     video_sender.start_video_rcv()
+    audio_sender.start()
 
     # Sockets that can run on the main thread. These sockets' endpoints should not block for long (say 50 ms at most).
     receivers = [main_receiver, actuation_receiver]