Add Milvus vector store

[toliguo]

• Added Milvus Vector Store

Description

• Added Milvus Vector Store

Proposed Changes

[List the specific changes made in this pull request.]

Checklist

• I have tested these changes locally.
• I have reviewed the code changes.
• I have updated the documentation (if necessary).
• I have added appropriate unit tests (if applicable).

Additional Notes

[Add any additional notes or context that may be helpful for the reviewer(s).]

[cbornet]

Duplicate of #376 ?

[toliguo]

Duplicate of #376 ?

It seems to have the same effect.

[toliguo]

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