Enhancement: Extract Count

[localheinz]

This PR

• extracts Count as a value object

[codecov]

Codecov Report

Merging #262 into main will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #262      +/-   ##
============================================
+ Coverage     97.57%   97.60%   +0.02%     
- Complexity       93       98       +5     
============================================
  Files            20       21       +1     
  Lines           247      250       +3     
============================================
+ Hits            241      244       +3     
  Misses            6        6              

Impacted Files	Coverage Δ	Complexity Δ
src/Count.php	100.00% <100.00%> (ø)	3.00 <3.00> (?)
src/FieldDefinition.php	100.00% <100.00%> (ø)	11.00 <3.00> (+2.00)
src/FieldDefinition/References.php	100.00% <100.00%> (ø)	2.00 <1.00> (-1.00)
src/FixtureFactory.php	96.36% <100.00%> (-0.10%)	42.00 <4.00> (+1.00)	⬇️

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