docs: contributed Graph RAG Retriever integration

[epinzur]

Description:

This adds the Graph RAG Retriever integration documentation, per https://python.langchain.com/docs/contributing/how_to/integrations/.

• The integration exists in this public repository: https://github.com/datastax/graph-rag
• We've implemented the standard langchain tests for retrievers: https://github.com/datastax/graph-rag/blob/main/packages/langchain-graph-retriever/tests/test_langchain.py
• Our integration is published to PyPi: https://pypi.org/project/langchain-graph-retriever/

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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 12, 2025 10:09pm

[ccurme]

Very nice!