Provider Request: Mistral and Codestral

[puresick]

Having Mistral as an option would be awesome!
They also have a free version of their Codestral API (which you can access if you register your phone number with them) with the following API endpoints:

• Completion Endpoint: https://codestral.mistral.ai/v1/fim/completions
• Chat Endpoint: https://codestral.mistral.ai/v1/chat/completions

[nikaro]

FTR: #118