Add OpenAI proxy (#1503)

Co-authored-by: Deshraj Yadav <deshrajdry@gmail.com>

mem0/utils/factory.py

@@ -55,6 +55,8 @@ class VectorStoreFactory:
     def create(cls, provider_name, config):
         class_type = cls.provider_to_class.get(provider_name)
         if class_type:
+            if not isinstance(config, dict):
+                config = config.model_dump()
             vector_store_instance = load_class(class_type)
             return vector_store_instance(**config)
         else: