Add quicklint make target (#56559)
Summary:
This queries the local git repo for changed files (any changed files, not just committed ones) and sends them to mypy/flake8 instead of the default (which is the whole repo, defined the .flake8 and mypy.ini files). This brings a good speedup (from 15 seconds with no cache to < 1 second from my local testing on this PR).
```bash
make quicklint -j 6
```
It should be noted that the results of this aren’t exactly what’s in the CI, since mypy and flake8 ignore the `include` and `exclude` parts of their config when an explicit list of files is passed in.
](https://our.intern.facebook.com/intern/diff/27901577/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56559
Pulled By: driazati
Reviewed By: malfet
Differential Revision: D27901577
fbshipit-source-id: 99f351cdfe5aba007948aea2b8a78f683c5d8583
Author
davidriazati@fb.com
