feat: add array_contains and array_overlaps operators for pgvector metadata filtering.

[micha-f]

Related Issues

• proposal for #1351

Proposed Changes:

Add array_contains (all items must be present in array) and array_overlaps (at least on item must be present in array) operators for PGVector metadata filtering.

How did you test it?

Since filterable_docs did not contain arrays in the document metadata, I added tests with custom documents containing arrays of tags in their metadata.

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.