feat: add RedisKVStorage, MilvusVectorStorage, and NebulaGraphStorage

[utopia2077]

• Implement RedisKVStorage for key-value storage.
• Implement MilvusVectorStorage for vector storage.
• Implement NebulaGraphStorage for graph storage. Refer to feat: NebulaGraph as persistant layer #9
• Add tests for NebulaGraphStorage to ensure functionality.

TODO

• Test for RedisKVStorage,MilvusVectorStorage
• docs

[gusye1234]

Hi, MilvusStorage is already implemented, referring to this. We remove it from the package because the milvus-lite doesn't support window platform and we hope anyone can have a try of the default nano-graphrag.

Also great work!

[gusye1234]

Hi @utopia2077 , I think you should change your base branch to main.