ENH: Add Styler.pipe() method (#23229)
Added `Styler.pipe()` method.  This allows users to easily apply and compose functions that operate on Styler objects, just like the `DataFrame.pipe()` method does for dataframes.

- [x] closes #23229
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry