enh: kb metadata search

backend/open_webui/retrieval/vector/dbs/oracle23ai.py

@@ -521,7 +521,7 @@ class Oracle23aiClient(VectorDBBase):
                 raise
 
     def search(
-        self, collection_name: str, vectors: List[List[Union[float, int]]], limit: int
+        self, collection_name: str, vectors: List[List[Union[float, int]]], filter: Optional[dict] = None, limit: int = 10
     ) -> Optional[SearchResult]:
         """
         Search for similar vectors in the database.