[Build] Start enforcing code format

[riedgar-ms]

Although a previous change ran black on the entire codebase, this wasn't being enforced. Such leniency ends now.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.10%. Comparing base (b2522fd) to head (2ec70c3).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #809      +/-   ##
==========================================
+ Coverage   56.72%   62.10%   +5.38%     
==========================================
  Files          56       56              
  Lines        4159     4159              
==========================================
+ Hits         2359     2583     +224     
+ Misses       1800     1576     -224     

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[riedgar-ms]

Please note that this PR is running on the "silence is assent" principle.

[Harsha-Nori]

Upon discussion with @slundberg, I think we'll want to experiment with the changing black settings before auto-enforcing it through the whole codebase. It was good to kick the tires on how we feel developing in a black formatted environment, but there's some annoyances that I think setting changes could iron out.

For example, we should see if we can disable the excessive multi-lining that happens on lines like this:

or

I also think black behaves a bit oddly when we have trailing comments on a line explaining what that line does. For example, the change to this else clause in the Engine.next() method is particularly gratuitous, and I think it's just because we have a comment explaining the line.

I suspect many of these will be solved/mitigated by just extending the default line length to e.g. 120. Some investigation into if there's a config change we can make to better handle the "short code, long comment" on a line too would be good.

[riedgar-ms]

Closing for now.