Python 3: flake8-black code style validation request

#1

Please consider adding Python code style validation with flake8-black .

I already <3 you. But you already know that.

Tyvm.

#2

@evdwatt thank you for the question.
Similarly to Ariake Dark Theme Request, where are you suggesting to include the extension? Are you suggesting to include it in the theia-python docker image?