Add type informations to torch/storage.py (#46876)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/46875
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46876
Reviewed By: glaringlee
Differential Revision: D24758448
Pulled By: ezyang
fbshipit-source-id: afbc19637fbfaa1b0276cdd707043111aee3abc3
