feat: Improve coverage support

[zobo]

Added support for alternative Clover format and one basic test.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 95.09%. Comparing base (1ebe2bf) to head (2d31020).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
src/CloverParser.ts	60.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #246      +/-   ##
==========================================
+ Coverage   94.24%   95.09%   +0.84%     
==========================================
  Files          53       53              
  Lines        3633     3668      +35     
  Branches      767      782      +15     
==========================================
+ Hits         3424     3488      +64     
+ Misses        207      178      -29     
  Partials        2        2              

Flag	Coverage Δ
unittests	95.01% <60.00%> (+0.84%)	⬆️

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