[Feature]: Create GraphRAG

[Dang-Tu-lang]

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Hello everyone, GraphRAG is very good for legal and healthcare document. i readed the nano-graphrag https://github.com/gusye1234/nano-graphrag. for using for llama3.1 with API serverless. However, sometime , i use llama3.1 not response json format, i know this is a API error. How i use agentscope for create GraphRAG like nano-graphrag