Adding GCP Bigquery vector search with ChatGPT cookbook

[pap-openai]

Summary

Adding a cookbook on GCP Vector search for a quick RAG set-up for ChatGPT with metadata filtering, GCP project set-up, OpenAI Embeddings and a GCP function acting as a middleware.

Motivation

Providing more options to run RAG quickstart tutorials with a GCP option. (We already have the Azure one).

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[pap-openai]

@maxreid-openai if you could review this entry based
the author file is updated in another PR that I'd expect to merge (hopefully) soon too

[maxreid-openai]

Added two comments but overall looks good!

[pap-openai]

thanks @maxreid-openai, fixed now!
@aaronwilkowitz-openai if you want to do a final review?

[aaronwilkowitz-openai]

Looks good!