release graph-based Retrieval-Augmented Generation (RAG) system upgrade version

[tqangxl]

🚀 The feature

release graph-based Retrieval-Augmented Generation (RAG) system （better than graphRAG）upgrade version ADD https://github.com/opendatalab/PDF-Extract-Kit

Motivation, pitch

graph-based Retrieval-Augmented Generation (RAG) system

MAKE LOCAL RAG system better！

[deshraj]

Thanks for opening this issue @tqangxl. Graph-RAG is on our roadmap already and we will push it soon.