Add Deepgram TTS functionality

[ofa5er]

Deepgram can do TTS and it is very cheap compared to all other alternatives 1.5$ for 100k characters (vs Elevenlabs 22$ for 100k).

Could you add the TTS support to Deepgram this is not only beneficial from a cost perspective but Deepgram has low latency and also having one provider that offers TTS and STT reduces the overhead of working with different providers.

FYI, Other opensrouce frameworks such as Pipecat supports already deepgram TTS.