Add typing annotations for torch.utils.data.* modules (#44136)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/44135
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44136
Reviewed By: gchanan
Differential Revision: D23963273
Pulled By: ezyang
fbshipit-source-id: 939234dddbe89949bd8e5ff05d06f6c8add6935c
