Add pre-commit hooks

[lpsinger]

See nasa-gcn/gcn-classic-to-json#21.

[codecov]

Codecov Report

Attention: Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.06%. Comparing base (52f5c7d) to head (4ef8bdb).
Report is 4 commits behind head on main.

Files	Patch %	Lines
gcn_kafka/core.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
- Coverage   76.85%   76.06%   -0.80%     
==========================================
  Files           7        7              
  Lines         121      117       -4     
==========================================
- Hits           93       89       -4     
  Misses         28       28              

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[dakota002]

It looks good, the only thing that failed was 1 line that it says isn't covered