Fix: Move resolution of Count to FixtureFactory

[localheinz]

This PR

• moves the responsibility for resolving the value of Count from Count to FixtureFactory

[codecov]

Codecov Report

Merging #351 into main will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main     #351   +/-   ##
=========================================
  Coverage     98.93%   98.93%           
  Complexity      100      100           
=========================================
  Files            22       22           
  Lines           281      281           
=========================================
  Hits            278      278           
  Misses            3        3           

Impacted Files	Coverage Δ	Complexity Δ
src/Count.php	100.00% <100.00%> (ø)	8.00 <2.00> (ø)
src/FixtureFactory.php	97.85% <100.00%> (+0.03%)	47.00 <0.00> (ø)

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