feat(RAG):add metadata properties filters

[Aries-ckt]

Close #1387

Description

• Add Metadata Properties Filters for VectorStore

How to Use

metadata_filter = MetadataFilter(key="Header2", value="AWEL Design")
filters = MetadataFilters(filters=[metadata_filter])
chunks = await retriever.aretrieve_with_scores(
     "what is awel talk about", 0.0, filters
)

How Has This Been Tested?

python examples/rag/metadata_filter_example.py

Snapshots:

Include snapshots for easier review.

Checklist:

• My code follows the style guidelines of this project
• I have already rebased the commits and make the commit message conform to the project standard.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• Any dependent changes have been merged and published in downstream modules

[csunny]

r+

[fangyinc]

LGTM.