VectorStore -> BasePydanticVectorStore, also get/delete_nodes, clear()

[logan-markewich]

• Migrates all remaining vector stores to pydantic base class
• Updates typing
• Add new get/delete_nodes() and clear() methods
• Implement new methods some simple, qdrant, and chroma
• add tests for simple, qdrant, and chroma

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[nerdai]

Nice! I'm just getting caught up with #13352 which I think needs this, right?

[logan-markewich]

@nerdai yea, in order to make that less janky, the new methods here will be very helpful

[nerdai]

Do we plan to deprecate VectorStore now in favour of BasePydanticVectorStore?

[logan-markewich]

@nerdai yes -- every vector store should use the pydantic base class yet. I kept the old one in the code in case anyone was importing and subclassing it though