BUG: pass *args and **kwargs for wrapped methods in Groupby (#14107)
- [x] closes #14107 
- [ ] tests added / passed
- [ ] passes `git diff upstream/master | flake8 --diff`
- [ ] whatsnew entry

Methods such as 'hist' that take keyword arguments would now be able to be called via a Groupby object and the keyword args would be passed onwards to matplotlib as the user expects.
