first pass at turn based conversation

vocode/streaming/output_device/base_output_device.py

@@ -0,0 +1,13 @@
+from vocode.streaming.models.audio_encoding import AudioEncoding
+
+
+class BaseOutputDevice:
+    def __init__(self, sampling_rate: int, audio_encoding: AudioEncoding):
+        self.sampling_rate = sampling_rate
+        self.audio_encoding = audio_encoding
+
+    async def send_async(self, chunk):
+        raise NotImplemented
+
+    async def maybe_send_mark_async(self, message):
+        pass