Add a notebook version of the RAG getting started guide

[jseldess]

Add notebook version of https://docs.pinecone.io/guides/get-started/build-a-rag-chatbot.

Type of Change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
• [ ] Infrastructure change (CI configs, etc)
• [ ] Non-code change (docs, etc)
• [ ] None of the above: (explain here)

Test Plan

Describe specific steps for validating this change.

[review-notebook-app[bot]]

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