feat: base class for llms

[mattzcarey]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context.

Building .llm to be a collection of LLM classes.

[x] BaseBrainPicking
[ ] OpenAIBrainPicking (old brainpicking) WIP
[ ] OpenAIFunctionsBrainPicking WIP
[ ] PrivateGPT4AllBrainPicking (old privatebrainpicking) WIP

Checklist before requesting a review

Please delete options that are not relevant.

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented hard-to-understand areas
• I have ideally added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged

Screenshots (if appropriate):

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 3, 2023 8:11am
quivrapp	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 3, 2023 8:11am