Fix: Rename Number to Count

[localheinz]

This PR

• renames Number to Count

[codecov]

Codecov Report

Merging #309 into main will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #309      +/-   ##
============================================
- Coverage     98.95%   98.95%   -0.01%     
  Complexity      103      103              
============================================
  Files            23       23              
  Lines           288      287       -1     
============================================
- Hits            285      284       -1     
  Misses            3        3              

Impacted Files	Coverage Δ	Complexity Δ
src/Count.php	100.00% <100.00%> (ø)	8.00 <0.00> (?)
src/Exception/InvalidCount.php	100.00% <100.00%> (ø)	1.00 <1.00> (?)
src/FieldDefinition.php	100.00% <100.00%> (ø)	9.00 <1.00> (ø)
src/FieldDefinition/References.php	100.00% <100.00%> (ø)	2.00 <1.00> (ø)
src/FixtureFactory.php	97.45% <100.00%> (ø)	39.00 <2.00> (ø)

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