Enhancement: Sort extra fields

[localheinz]

This PR

• sorts extra fields when attempting to get an instance from the fixture factory where field overrides reference fields not available in the entity

[codecov]

Codecov Report

Merging #82 into master will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #82      +/-   ##
============================================
+ Coverage     93.53%   93.56%   +0.03%     
  Complexity       76       76              
============================================
  Files             8        8              
  Lines           201      202       +1     
============================================
+ Hits            188      189       +1     
  Misses           13       13              

Impacted Files	Coverage Δ	Complexity Δ
src/FixtureFactory.php	90.90% <100.00%> (+0.10%)	37.00 <0.00> (ø)

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