Enhancement: Extract Duration

[localheinz]

This pull request

• extracts Duration as a value object

Related to #291.

[codecov]

Codecov Report

Merging #351 (fd60b37) into main (61a4f7d) will increase coverage by 0.74%.
The diff coverage is 98.38%.

❗ Current head fd60b37 differs from pull request most recent head b18a2d5. Consider uploading reports for the commit b18a2d5 to get more accurate results

@@             Coverage Diff              @@
##               main     #351      +/-   ##
============================================
+ Coverage     94.64%   95.38%   +0.74%     
- Complexity       61       77      +16     
============================================
  Files            15       18       +3     
  Lines           299      347      +48     
============================================
+ Hits            283      331      +48     
  Misses           16       16              

Files	Coverage Δ
src/Comparator/DurationComparator.php	100.00% <ø> (ø)
src/Duration.php	100.00% <100.00%> (ø)
src/Exception/InvalidNanoseconds.php	100.00% <100.00%> (ø)
src/Exception/InvalidSeconds.php	100.00% <100.00%> (ø)
src/Formatter/DefaultDurationFormatter.php	100.00% <100.00%> (ø)
src/MaximumDuration.php	100.00% <100.00%> (ø)
src/Reporter/DefaultReporter.php	95.83% <100.00%> (ø)
src/SlowTest.php	100.00% <100.00%> (ø)
src/Subscriber/TestPassedSubscriber.php	97.22% <100.00%> (ø)
src/TimeKeeper.php	76.47% <83.33%> (+7.23%)	⬆️

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