[Feature Request]: Improve Entity Extraction Accuracy with Google's LangExtract Library

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Is your feature request related to a problem? Please describe.

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Describe the solution you'd like

Hi GraphRAG Team,

I'm proposing a feature to enhance entity extraction accuracy using Google's langextract library.

I believe its strengths in grounding extracted entities to the source text and enforcing a strict schema could be a great addition to the project.

I have already successfully implemented a proof-of-concept on my local machine. If this sounds interesting to you, I am ready and happy to submit a Pull Request for review.

Please let me know your thoughts. Thanks!

Additional context

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