Avoid leaking has_torch_function and handle_torch_function in torch namespace (#46680)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/46680
Reviewed By: zou3519
Differential Revision: D24459823
Pulled By: albanD
fbshipit-source-id: 4ff6925afcf14214dc45921bca0d2f33ca1944a1
