Add support for Gemini's Multimodal Live API

[willbakst]

Description

https://ai.google.dev/api/multimodal-live

We should add support like we have for OpenAI, and in the process we should unify the interfaces to provide a provider-agnostic Realtime interface.

[Kigstn]

Somewhat related so I want to add that remark here: Google also introduced a new python SDK --> https://github.com/googleapis/python-genai

This unifies the interface between AI Studio & Vertex AI. So just for that it is worth considering IMO :)

[willbakst]

Somewhat related so I want to add that remark here: Google also introduced a new python SDK --> https://github.com/googleapis/python-genai

This unifies the interface between AI Studio & Vertex AI. So just for that it is worth considering IMO :)

I've created a new issue #750 to track this