TYP: make the type annotations of read_csv & read_table discoverable
- [x] closes #25648
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

In master the type of ``read_csv`` and ``read_table`` is 'Any'.  This PR makes the functions signatures discoverable by mypy. Also fixes the error message when wrong kwarg is passed.