CLI commands for creating OpenAI Assistants

[jlewi]

We'd like to create a really good story for integrating with technical documentation. If you have technical documentation you'd like to "chat your docs". To experiment with that we can use OpenAI Assistants.

An OpenAI Assistant can answer queries using RAG using a bunch of files you uploaded. The advantage of using OpenAI Assistant is it automatically handles

• Segmenting and chunking documents
• VectorDatabase
• RAG

This PR contains some CLI commands to

• Create an Assistant from a YAML file
• Create a Vector store from a YAML file
• Sync the files in a directory to OpenAI

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[jlewi]

Code is pretty rough in its current state.
It doesn't properly handle resyncing changes to OpenAI. This is partly due to limitations in the API. There's no way with the existing API to easily track what version of a file we have.
We also depend on a fork of the go-openai client
sashabaranov/go-openai#919