Add support for: streaming, model lists, LM Studio, OpenRouter, more Google Gemini's

[cleesmith]

It would be great to have support for these:

1. streaming AI responses - totally expected in chats

2. get a list of models for each/selected provider - as models change frequently nowadays, it's better to ask for a list from the provider than keep my own list up-to-date

3. add LM Studio - nice local LLM server with lots of models

4. add OpenRouter - 200+ models, and one api key to get to them all

5. add Google's free Gemini in additional to Advanced and Vertex

Thanks for your efforts to "normalize" the LLM requests/responses to "fit" OpenAI's API ...
why all of the AI providers can not agree on a standard API is puzzling (or is it?).

[chris0517-sb]

yeah

[rseward]

+1 for gemini-pro support! Don't make me create a pull request. ;-)