onnxruntime

Resolve issue with wrapped ORTModule load_state_dict (#7847)

* Encapsulate children modules inside a ModuleAccessor object to prevent erroneuos iteration over children while loading the state dictionary

* Add named_models, models, apply methods, change ModuleAccessor to ModuleMetadata and modify unit tests

* Change ModuleMetadata module getter logic, raise NotImplementedError for add_modules

* Add comment explaining why overriding _load_from_state_dict method is needed