Added async OpenAI services (#1)

* added async openai services

* added async openai services

* added Deepgram service with 05 example

* modernized the 'say one thing' example

* async all the things

* cleanup and user greeting

* more cleanup

src/dailyai/services/deepgram_ai_services.py

@@ -0,0 +1,29 @@
+import aiohttp
+import asyncio
+import os
+
+import requests
+
+from collections.abc import AsyncGenerator
+from dailyai.services.ai_services import TTSService
+
+class DeepgramTTSService(TTSService):
+    def __init__(self, speech_key=None, voice=None):
+        super().__init__()
+
+        self.voice = voice or os.getenv("DEEPGRAM_VOICE") or "alpha-asteria-en-v2"
+        self.speech_key = speech_key or os.getenv("DEEPGRAM_API_KEY")
+    
+    def get_mic_sample_rate(self):
+        return 24000
+
+    async def run_tts(self, sentence) -> AsyncGenerator[bytes, None]:
+        self.logger.info(f"Running deepgram tts for {sentence}")
+        base_url = "https://api.beta.deepgram.com/v1/speak"
+        request_url = f"{base_url}?model={self.voice}&encoding=linear16&container=none&sample_rate=16000"
+        headers = {"authorization": f"token {self.speech_key}"}
+        body = { "text": sentence }
+        async with aiohttp.ClientSession() as session:
+            async with session.post(request_url, headers=headers, json=body) as r:
+                async for data in r.content:
+                    yield data