Add the support of Azure OpenAI

[MichaelBlueGeneva]

I don't think it's that complicate since it's almost as OpenAI but it would be interesting to extend the range of LLM Provider avaible

[nicoloboschi]

any openai compatible provider works - see here: #49 (comment)

I'll improve the documentation

EDIT: clarified documentation https://hindsight.vectorize.io/developer/models#llm

[MichaelBlueGeneva]

Nice and thansk for the quick answer