Enhancement: Merge Definitions into FixtureFactory::load()

[localheinz]

This PR

• merges Definitions into FixtureFactory::load()

[codecov]

Codecov Report

Merging #313 into main will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #313      +/-   ##
============================================
- Coverage     98.96%   98.93%   -0.03%     
+ Complexity      104      101       -3     
============================================
  Files            23       22       -1     
  Lines           289      283       -6     
============================================
- Hits            286      280       -6     
  Misses            3        3              

Impacted Files	Coverage Δ	Complexity Δ
src/FixtureFactory.php	97.85% <100.00%> (+0.35%)	48.00 <8.00> (+8.00)

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