Format the whole repo with Black

[tkrabel-db]

What is changed in that PR?

Fixes #392, i.e. this PR auto formats the whole repo using black to see the diff.

black is arguably the most popular formatter out there.

What needs to be changed further?

Some black re-formattings violate pylint and pycodestyle, e.g.

pycodestyle

# All errors are of this form
test/test_text_edit.py:27:9: W503 line break before binary operator
...

pylint pylsp

************* Module test.test_workspace
test/test_workspace.py:240:0: W1404: Implicit string concatenation found in call (implicit-str-concat)
test/test_workspace.py:259:0: W1404: Implicit string concatenation found in call (implicit-str-concat)
************* Module pylsp.plugins.pylint_lint
pylsp/plugins/pylint_lint.py:292:12: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)
pylsp/plugins/pylint_lint.py:294:0: I0021: Useless suppression of 'consider-using-with' (useless-suppression)
************* Module pylsp.plugins.rope_autoimport
pylsp/plugins/rope_autoimport.py:33:0: R0911: Too many return statements (7/6) (too-many-return-statements)
pylsp/plugins/rope_autoimport.py:35:0: I0021: Useless suppression of 'too-many-return-statements' (useless-suppression)

My suggestion:

• blacktakes care of code styling, so we can remove pycodestyle altogether.
• pylint goes deeper, as it also e.g. cares about import order, so I suggest the user needs to fix these manually