Fix: Move operations from EntityDefinition to FixtureFactory

[localheinz]

This PR

• moves operations from EntityDefinition to FixtureFactory

[codecov]

Codecov Report

Merging #98 into master will not change coverage.
The diff coverage is 93.93%.

@@            Coverage Diff            @@
##             master      #98   +/-   ##
=========================================
  Coverage     93.77%   93.77%           
+ Complexity       77       76    -1     
=========================================
  Files             9        9           
  Lines           209      209           
=========================================
  Hits            196      196           
  Misses           13       13

Impacted Files	Coverage Δ	Complexity Δ
src/EntityDefinition.php	100% <100%> (+4.54%)	5 <0> (-8)	⬇️
src/FixtureFactory.php	91.59% <93.75%> (+0.79%)	43 <3> (+7)	⬆️

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