[MacOS] Add unit tests for Metal ops (#50312)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50312
Integrate the operator tests to the MacOS playground app, so that we can run them on Sandcastle
ghstack-source-id: 119693035
Test Plan:
- `buck test pp-macos`
- Sandcastle tests
Reviewed By: AshkanAliabadi
Differential Revision: D25778981
fbshipit-source-id: 8b5770dfddba0ca19f662894757b2dff66df87e6
