ENH: Allow plotting backend to be an option
- [x] closes #28619
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

Hello @jsignell! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:





There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2019-11-05 15:39:27 UTC Hmm I haven't added any docs. I suppose there should at least be a mention in the docstring. I think this is ready. @jsignell can you rebase Thanks @jsignell!