add boolean converter + tests

[clementtalleu]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 93.10345% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.85%. Comparing base (afa3d9e) to head (7134f29).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/Om/Converters/BooleanConverter.php	87.50%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##               main      #62      +/-   ##
============================================
+ Coverage     82.72%   82.85%   +0.12%     
- Complexity      451      460       +9     
============================================
  Files            39       40       +1     
  Lines           990     1009      +19     
============================================
+ Hits            819      836      +17     
- Misses          171      173       +2     

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