DA-1075 add gsi tutorial pydanticai

[AayushTyagi1]

Added GSI Tutorial

[gemini-code-assist]

Summary of Changes

Hello @AayushTyagi1, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the repository's semantic search examples by introducing a new set of tutorials demonstrating vector search using Couchbase's Global Secondary Index (GSI) capabilities. This provides an alternative to the existing Full Text Search (FTS) approach, offering users more flexibility in implementing RAG patterns. The changes involve reorganizing existing tutorial files into dedicated fts/ subdirectories and adding new gsi/ subdirectories with necessary configuration and metadata files for the GSI examples. The main README.md is also updated to guide users through both FTS and GSI approaches.

Highlights

• Tutorial Restructuring: Existing RAG tutorials for AWS Bedrock, Claude, and PydanticAI have been reorganized into dedicated fts/ subdirectories to clearly distinguish them as Full Text Search (FTS) based examples.
• Introduction of GSI Tutorials: New gsi/ subdirectories have been added for AWS Bedrock, Claude, and PydanticAI, including new environment sample files and frontmatter, to introduce Global Secondary Index (GSI) based vector search tutorials.
• README Updates for Clarity: The README.md has been updated to explain the two distinct approaches (FTS and GSI) for semantic search, providing clear setup instructions for each method.
• Claude Model Version Update: The Claude AI tutorial has been updated to utilize the newer Claude 4 Sonnet model, replacing the previous Claude 3.7 Sonnet.

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[gemini-code-assist]

Code Review

This pull request introduces a significant and valuable restructuring by adding GSI (Global Secondary Index) tutorials alongside the existing FTS (Full Text Search) examples. The changes primarily involve reorganizing files and updating documentation to reflect the two different approaches. My review focuses on ensuring consistency across the new structure and maintaining documentation quality. I've identified a few areas for improvement, including a potentially accidental removal of important sections in the main README, some inconsistencies in the new documentation, and minor style issues.