Add support for filters and namespaces in similarity search in Pinecone similarity_score_threshold (#7301)
At the moment, pinecone vectorStore does not support filters and
namespaces when using similarity_score_threshold search type.
In this PR, I've implemented that. It passes all the kwargs except
"score_threshold" as that is not a supported argument for method
"similarity_search_with_score".
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Co-authored-by: Bagatur <baskaryan@gmail.com>