Add codecov config

[tangrufus]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.53%. Comparing base (d90c03a) to head (6135808).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main       #6   +/-   ##
=========================================
  Coverage     78.53%   78.53%           
  Complexity       64       64           
=========================================
  Files            13       13           
  Lines           191      191           
=========================================
  Hits            150      150           
  Misses           41       41           

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