Add ufmt to unify black and usort (#81157)
This reworks [80257](https://github.com/pytorch/pytorch/pull/80257) a bit to use ufmt:
* ufmt https://ufmt.omnilib.dev/en/stable/ unifies both black and usort to automatically format the file in the "most Pythonic" way
* Also make a demo run for all files in `tools/linter/**/*.py`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/81157
Approved by: https://github.com/suo
