Add Support for Mistral API

[PyriteCloud]

I want to use the Codestral model through the Mistral API, which is currently free.

[mrT23]

you are welcome to open a PR to add this. should be similar to many other models supported via litellm

https://docs.litellm.ai/docs/providers/mistral

https://github.com/Codium-ai/pr-agent/blob/4ab939204274bdc1bdecfa951df1060f71c2ff58/pr_agent/algo/ai_handlers/litellm_ai_handler.py#L17

[JaynouOliver]

great, I'll be working on this, I actually made a PR agent this week on my own - https://github.com/JaynouOliver/pr-ai-agent
Just need some guidance, happy to contribute here

[mrT23]

Review the file i referenced.

You just need to replicate the logic to accommodate the new key (and validate it works)

[JaynouOliver]

great