add AnalyticDB MySQL for kv&vector storage.

[freamdx]

Description

AnalyticDB MySQL for kv and vector storage.

about AnalyticDB MySQL, please visit
AnalyticDB MySQL official site

Changes Made

1. add new python file lightrag/kg/adb_mysql_impl.py
2. modify lightrag/kg/init.py
3. modify env.sample, requirements_XXX.txt

Additional Notes

For Example:
.. code-block:: python
rag = LightRAG(
working_dir=WORKING_DIR,
llm_model_func=llm_model_func,
embedding_func=EmbeddingFunc(
embedding_dim=1024,
max_token_size=8192,
func=embedding_func,
),
#rerank_model_func=rerank_model_func,
#tiktoken_model_name="gpt-4o-mini",
#graph_storage="NetworkXStorage",
kv_storage="ADBKVStorage",
vector_storage="ADBVectorStorage",
doc_status_storage="ADBDocStatusStorage",
)

[danielaskdd]

Thank you for your interest in LightRAG and for your valuable contribution. As LightRAG is currently undergoing a period of significant architectural evolution, we must be cautious with adding support for new storage engines. Each new implementation introduces substantial overhead in terms of compatibility testing, performance tuning, and data migration maintenance during system upgrades. Therefore, we are not merging PRs for new storage implementations at this time. We appreciate your understanding and support.