Enhancement: Implement DurationComparator

[localheinz]

This pull request

• implements a DurationComparator

[codecov]

Codecov Report

Merging #18 (ce25a21) into main (3684509) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main       #18   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        20        23    +3     
===========================================
  Files              5         6    +1     
  Lines             62        67    +5     
===========================================
+ Hits              62        67    +5     

Impacted Files	Coverage Δ	Complexity Δ
src/Comparator/DurationComparator.php	100.00% <100.00%> (ø)	3.00 <3.00> (?)
src/SlowTestCollector.php	100.00% <0.00%> (ø)	10.00% <0.00%> (ø%)

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