Reset function for VectorDBs (#2584)

mem0/utils/factory.py

@@ -97,3 +97,9 @@ class VectorStoreFactory:
             return vector_store_instance(**config)
         else:
             raise ValueError(f"Unsupported VectorStore provider: {provider_name}")
+        
+    @classmethod
+    def reset(cls, instance):
+        instance.reset()
+        return instance
+