Enable black and isort formatters and checks

[bpkroth]

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Follow on work to #766.

This enabled both formatters and applies their changes to the repo.

Additionally, since black does not make changes to comments nor docstrings, we also enable docformatter to reformat docstrings which better aligns with pydocstyle rules as well. Without this additional change (and some manual fixups), pycodestyle and pylint would still complain about line lengths, for instance.