NDFrame.filter -> NDFrame.select
- [x] closes #26642
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

This PR moves ``NDFrame.filter`` over to ``NDFrame.select`` and deprecates ``NDFrame.filter``.

I'm not completely happy with the siganture from ``.filter``, and got some discussion points in #26642. The current PR can be seen as a first version, to be changed, if there's agreement,