Add black code formatter

[lpsinger]

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[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (5befca9) 60.18% compared to head (adcf935) 60.18%.
Report is 21 commits behind head on main.

Files	Patch %	Lines
gcn_classic_to_kafka/cli.py	0.00%	8 Missing ⚠️
gcn_classic_to_kafka/common.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #90   +/-   ##
=======================================
  Coverage   60.18%   60.18%           
=======================================
  Files           4        4           
  Lines         108      108           
=======================================
  Hits           65       65           
  Misses         43       43           

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