Use real argument names for Python functions (#29300)
Summary:
This hooks up `inspect` so that Python functions get their parameters
names attached instead of naming them `0, 1, 2, ...`. This also fixes
issue #28537 where `ignore` functions were improperly typing `self`.
](https://our.intern.facebook.com/intern/diff/19256434/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29300
Pulled By: driazati
Differential Revision: D19256434
fbshipit-source-id: 6a1fe7bd0afab708b8439517798955d0abfeb44c
