community: add score to PineconeHybridSearchRetriever (#25781)

**Description:**

Adds the 'score' returned by Pinecone to the
`PineconeHybridSearchRetriever` list of returned Documents.

There is currently no way to return the score when using Pinecone hybrid
search, so in this PR I include it by default.

---------

Co-authored-by: Chester Curme <[email protected]>

Author: cjber

libs/community/langchain_community/retrievers/pinecone_hybrid_search.py

@@ -173,8 +173,9 @@ def _get_relevant_documents(
         final_result = []
         for res in result["matches"]:
             context = res["metadata"].pop("context")
-            final_result.append(
-                Document(page_content=context, metadata=res["metadata"])
-            )
+            metadata = res["metadata"]
+            if "score" not in metadata and "score" in res:
+                metadata["score"] = res["score"]
+            final_result.append(Document(page_content=context, metadata=metadata))
         # return search results as json
         return final_result