feat(valkey): ValkeyStorage vector memory backend

Add ValkeyStorage, a distributed StorageBackend implementation using
Valkey-GLIDE with Valkey Search for vector similarity. Wire it into
Memory as the 'valkey' storage option. Pin scrapegraph-py<2 to fix
unrelated upstream breakage.

Part 4/4 of Valkey storage implementation.

Author: MatthiasHowellYopp

lib/crewai/src/crewai/memory/storage/valkey_storage.py

@@ -215,6 +215,17 @@ def model_post_init(self, __context: Any) -> None:
                 from crewai.memory.storage.lancedb_storage import LanceDBStorage
 
                 self._storage = LanceDBStorage()
+            elif self.storage == "valkey":
+                from crewai.memory.storage.valkey_storage import ValkeyStorage
+                from crewai.utilities.cache_config import parse_cache_url
+
+                conn = parse_cache_url() or {}
+                self._storage = ValkeyStorage(
+                    host=conn.get("host", "localhost"),
+                    port=conn.get("port", 6379),
+                    db=conn.get("db", 0),
+                    password=conn.get("password"),
+                )
             else:
                 from crewai.memory.storage.lancedb_storage import LanceDBStorage