Portkey AI with Pinecone cookbook

[siddharthsambharia-portkey]

Problem

Current Pinecone documentation lacks examples integrating with Portkey AI for API monitoring and management, making it harder for users to build observable RAG applications.

Solution

Added cookbook demonstrating Pinecone + Portkey integration for RAG applications, showing how to combine vector search with Portkey's API management and monitoring capabilities.

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)
• [x] Non-code change (docs, etc)
• [ ] None of the above

Test Plan

1. Verified notebook executes end-to-end

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[siddharthsambharia-portkey]

@DosticJelena Can you take a look?