Convert type comments to annotations in caffe2/torch/util (#72667)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/72667
Created by running
```
python -m libcst.tool codemod --no-format --jobs=1 convert_type_comments.ConvertTypeComments ~/fbsource/fbcode/caffe2/torch/utils/ --no-quote-annotations
```
and then manually cleaning up unreadable function headers (which is needed due to lack of autoformatting).
Test Plan:
Wait for CI - usually type annotations are safe to land, but the jit
compiler sometimes can choke if there's a problem.
Reviewed By: grievejia
Differential Revision: D34148011
fbshipit-source-id: 8f7c7a3b5ef78e0dea6d10ce70072f39e6d1ecc3
(cherry picked from commit 25a929ef8dc15649dff2d1cc0bbe5f1fb20ae55b)
