Enhancement: Accept closure instead of array

[localheinz]

This PR

• turns the $configuration parameter of FixtureFactory::defineEntity() into $afterCreate, an optional closure that is invoked after object creation

Follows #1.

💁‍♂ The $configuration only ever handled an afterCreate key so far anyway.

[codecov]

Codecov Report

Merging #101 into master will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #101      +/-   ##
============================================
+ Coverage     93.71%   93.77%   +0.06%     
- Complexity       75       76       +1     
============================================
  Files             9        9              
  Lines           207      209       +2     
============================================
+ Hits            194      196       +2     
  Misses           13       13              

Impacted Files	Coverage Δ	Complexity Δ
src/EntityDefinition.php	100.00% <100.00%> (ø)	4.00 <2.00> (ø)
src/FixtureFactory.php	91.73% <100.00%> (+0.13%)	44.00 <10.00> (+1.00)

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