Add `_similarity_search_with_relevance_scores` in `Pinecone` (#6446)
Just so it is consistent with other `VectorStore` classes.
This is a follow-up of #6056 which also discussed the potential of
adding `similarity_search_by_vector_returning_embeddings` that we will
continue the discussion here.
potentially related: #6286
#### Who can review?
Tag maintainers/contributors who might be interested: @rlancemartin
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76ae9da9 - Add `_similarity_search_with_relevance_scores` in `Pinecone` (#6446)
