Add a new linter to run black on python files, and start applying it to some files. Remove these files from autopep8. The end goal is to entirely remove autopep8.
Some doc about black:
- https://black.readthedocs.io/en/stable/
- code style: https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html
- https://black.readthedocs.io/en/stable/the_black_code_style/#stability-policy
The `--experimental-string-processing` makes black split long strings into multiple lines. This seems important to me as not setting it would do the opposite: put the strings we already split back on a single line.