Add support for Azure OpenAI text-to-speech models

[nepalevov]

Feature request to implement support for Azure OpenAI's text-to-speech models. This would enable audio output capabilities within the adapter.

Currently, 2 models available, tts and tts-hd.

https://learn.microsoft.com/en-us/azure/ai-services/openai/concepts/models#text-to-speech-models-preview