Add OpenAI SDK

[SonjeVilas]

This PR adds a Jupyter notebook demonstrating how to call Google Gemini models (e.g., Gemini Pro) using the OpenAI Python SDK interface. Key features:

• Uses an adapter to translate OpenAI-style requests to Gemini’s API.
• Supports chat completions and embeddings with minimal code changes.
• Simplifies testing Gemini for developers familiar with OpenAI’s SDK.

Use Case: Enables quick prototyping, model comparison, and smoother migration between LLM providers.

[review-notebook-app[bot]]

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[andycandy]

A more detailed version of this notebook already exists in this repo ./quickstarts/Get_started_OpenAI_Compatibility.ipynb

[markmcd]

Please see the CONTRIBUTING guide for details on submitting new guides, and note that "step 1" is to file a new issue.

As @andycandy pointed out, we have this guide already, and it has the exposition we need in a guide.