add codecov configuration

[BSWANG]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.51%. Comparing base (ff107f0) to head (d95a880).
⚠️ Report is 5 commits behind head on main.

❌ Your project status has failed because you have indirect coverage changes. Learn more about Unexpected Coverage Changes and reasons for indirect coverage changes.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #875      +/-   ##
==========================================
- Coverage   44.55%   44.51%   -0.04%     
==========================================
  Files         130      130              
  Lines       18988    18988              
==========================================
- Hits         8460     8453       -7     
- Misses       9634     9640       +6     
- Partials      894      895       +1     

Flag	Coverage Δ
unittests	44.51% <ø> (-0.04%)	⬇️

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