BUG: Period.__eq__ numpy scalar (#44182 (comment))
- [x] fixes https://github.com/pandas-dev/pandas/pull/44182#issuecomment-956851322
- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit) for how to run them
- [ ] whatsnew entry

