add OpenAISTTService

[joachimchauvet]

This also works with OpenAI-compatible API providers such as Groq (requested in #254) by passing the base_url.

stt = OpenAISTTService(
    api_key=os.getenv("GROQ_API_KEY"),
    base_url="https://api.groq.com/openai/v1",
    model="distil-whisper-large-v3-en"
)

[aconchillo]

@joachimchauvet Thank you!!! Any chance we can rebase and try this again?

[joachimchauvet]

@aconchillo I rebased and updated to use the new SegmentedSTTService ;)

[aconchillo]

we should set transcription_enabled=False since we are using OpenAI's STT now.

[aconchillo]

And we should enable audio passthrough vad_audio_passthrough=True so the audio can reach the STT.

[aconchillo]

Thank you! Looks great! Added a couple of comments. Needs a rebase as well.

[joachimchauvet]

I updated but some files currently already in the repo were preventing the checks from passing. I think the main culprit was from the recently merged OpenAI realtime PR.
Let me know if you prefer me to exclude those @aconchillo

Edit: rebased on the most recent version that doesn't have formatting issues

[golbin]

@joachimchauvet I’m waiting.. 🙏