Add blackdoc and docformatter to wrap docstrings to 79 chars

Description of the desired feature

blackdoc is like black, but for docstrings! This will help with applying #384, and make our docstrings consistent with our code.

Would prefer for someone new-ish to take this on. Some knowledge of git commit-hooks would be useful, but you can see https://github.com/pydata/xarray/pull/4177 as an example on how another library has implemented it.

Are you willing to help implement and maintain this feature? No

[weiji14]

There’s some similarities between the standards (see this stackoverflow answer for an overview), but yes, let’s stick to numpydoc.

Actually after some thought, it might be better to make this an optional tool, since we already have black and pylint. Adding one more into the mix might act as a barrier to new contributors (who often face dozens of lint errors on their first Pull Request).

[leouieda]

Yes but our docstrings follow the NumPy style, not necessarily PEP257 😔 I haven’t seen those other tools, though. Might be worth investigating.