ENH: set __module__ for pandas scalars (Timestamp/Timedelta/Period)
Addresses part of #55178
Thanks for the PR!

Can you add those new cases to the existing test that was added here: https://github.com/pandas-dev/pandas/pull/55171/files#diff-f2ce09edfcd4e105695b327053c3d288fa9547b1b5cb6488da3f3213e5478870? There is another failing test that needs to be updated:

https://github.com/pandas-dev/pandas/blob/4f145b3a04ac2e9167545a8a2a09d30856d9ce42/pandas/tests/tslibs/test_timezones.py#L144-L146

The expected `msg` needs to be updated now This pull request is stale because it has been open for thirty days with no activity. Please [update](https://pandas.pydata.org/pandas-docs/stable/development/contributing.html#updating-your-pull-request) and respond to this comment if you're still interested in working on this.