Add PostgreSQL vector store

[toliguo]

• Added PostgreSQL vector store

Description

Added PostgreSQL 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

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[toliguo]

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[toliguo]

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[sebastianschramm]

Nice @toliguo !
Does it only need to be added to the VectorStoreFactory?

[toliguo]

Nice @toliguo ! Does it only need to be added to the VectorStoreFactory?

typing.py and init.py updated