Support api_key and base_url in config.yaml

[johnd0e]

Is your feature request related to a problem? Please describe.

I'm aware of set OPENAI_API_KEY and OPENAI_API_BASE env vars, but I'd rather set those in config.

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No response

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• I have verified that I am using the Go implementation of SGPT (this project) and that it is not another project

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[norrybul]

I'd be nice if it also supports custom OPENAI_API_KEY and OPENAI_API_BASE (or OPENAI_BASE_URL/Host) in User environment variables in Windows. Standard OpenAI APIs work fine though.
I was more thinking of these base on the request title.
https://litellm.vercel.app/docs/providers/openai
https://litellm.vercel.app/docs/providers/custom_openai_proxy
Anyway, tinkering a bit might make sgpt work.