feat: Add ChromaDB integration for vector storage #447
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- Implemented `ChromaVectorDBStorage` class in `lightrag/kg/chroma_impl.py` to support ChromaDB as a vector storage backend. - Updated `lightrag.py` to include `ChromaVectorDBStorage` in the storage class mapping. - Added a test script `test_chromadb.py` to demonstrate the usage of ChromaDB with LightRAG, including configuration for embedding functions and ChromaDB connection settings. - fix lazy import function to support package context for dynamic class loading. HKUDS@288d4b8
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ChromaVectorDBStorageclass inlightrag/kg/chroma_impl.pyto support ChromaDB as a vector storage backend.lightrag.pyto includeChromaVectorDBStoragein the storage class mapping.test_chromadb.pyto demonstrate the usage of ChromaDB with LightRAG, including configuration for embedding functions and ChromaDB connection settings.