Add ErrorIs and ErrorAs

[FollowTheProcess]

Summary

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.68%. Comparing base (4d09b51) to head (b10c24f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
test.go	80.00%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
- Coverage   85.20%   84.68%   -0.53%     
==========================================
  Files           2        2              
  Lines         311      346      +35     
==========================================
+ Hits          265      293      +28     
- Misses         31       36       +5     
- Partials       15       17       +2     

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