Add weekday value object

[christian-kolb]

Changes

• New value object.
• New Doctrine type.
• New normalizer.

[codecov]

Codecov Report

Attention: Patch coverage is 78.15126% with 26 lines in your changes missing coverage. Please review.

Project coverage is 96.79%. Comparing base (653a356) to head (30f19b1).
Report is 3 commits behind head on main.

❗ Current head 30f19b1 differs from pull request most recent head bb7c663

Please upload reports for the commit bb7c663 to get more accurate results.

Files	Patch %	Lines
src/Weekdays.php	0.00%	16 Missing ⚠️
src/Serializer/WeekdaysNormalizer.php	0.00%	10 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##                main      #55      +/-   ##
=============================================
- Coverage     100.00%   96.79%   -3.21%     
- Complexity       217      263      +46     
=============================================
  Files             16       24       +8     
  Lines            680      810     +130     
=============================================
+ Hits             680      784     +104     
- Misses             0       26      +26     

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