Couchbase Support for GraphRAG

[teetangh]

Description

This pull request adds a new Jupyter notebook demonstrating how to set up and use GraphRAG with Couchbase as a vector store. The notebook walks through the process of loading data, setting up models, storing embeddings, and running a search engine query.

Related Issues

N/A (or reference any existing issues if applicable)

Proposed Changes

• Set up Couchbase vector store integration
• Added new Jupyter notebook demonstrating graphrag with couchbase as vector strore
• Demonstrate a sample query execution

Checklist

[x] I have tested these changes locally. [x] I have reviewed the code changes. [x] I have updated the documentation (the notebook itself serves as documentation). [x ] I have added appropriate unit tests (if applicable).

Additional Notes

This notebook provides a comprehensive example of using GraphRAG with Couchbase, which can be valuable for users looking to implement similar setups. It covers important aspects such as environment configuration, data loading, model setup, and query execution.