feat(vector-store): Add Valkey vector store support (#3272)

mem0/configs/vector_stores/valkey.py

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+from pydantic import BaseModel
+
+
+class ValkeyConfig(BaseModel):
+    """Configuration for Valkey vector store."""
+
+    valkey_url: str
+    collection_name: str
+    embedding_model_dims: int
+    timezone: str = "UTC"
+    index_type: str = "hnsw"  # Default to HNSW, can be 'hnsw' or 'flat'
+    # HNSW specific parameters with recommended defaults
+    hnsw_m: int = 16  # Number of connections per layer (default from Valkey docs)
+    hnsw_ef_construction: int = 200  # Search width during construction
+    hnsw_ef_runtime: int = 10  # Search width during queries