feat: Python SDK Example: Gsheet / Cloud Functions / Looker SDK integration

[lanlooker]

• Add an example for Google Sheet / Cloud Functions / Looker SDK: Any GET request will trigger the cloud function to manage user provision based on a value in a cell inside an existing Google Sheet.
• The integration leverages Looker Python SDK, GCP's service account, and Google Sheet's gspread Python module

Demo: https://screencast.googleplex.com/cast/NjAyNTY5MDM2NzM5Mzc5Mnw0ZmQ4MTQwMC1lMQ
Expanding upon this previous PR: #849

Tagging Jax 🙏🏻 thank you for tagging a look

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[josephaxisa]

👍

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[lanlooker]

Hi Jax, I have to rewrite my code to use Google's official OAuth libraries (I was previously gspread, an open-source lib, not officially endorsed/supported by Google). Appreciate if you could take a quick look 🙏🏻 @josephaxisa

Most of the code remains unchanged, I just rewrote the function get_email_from_sheet() to use Google's libraries and changed README.md to reflect these changes

Screencast: https://screencast.googleplex.com/cast/NDUyNDI2NTgzMzQ5NjU3Nnw0M2VmMTI1YS04Mg

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[josephaxisa]

👍

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