ENH: set __module__ on `timedelta_range`
- [ ] Part of https://github.com/pandas-dev/pandas/issues/55178
- [ ] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

This decorates `timedelta_range` with `@set_module('pandas')` (similar to https://github.com/pandas-dev/pandas/pull/55171)


@jorisvandenbossche Thanks for reviewing! I did the same and resolved conflicts for this now.