Enhancement: Turn FieldDefinition into object

[localheinz]

This PR

• turns FieldDefinition into an object that can be passed around

[codecov]

Codecov Report

Merging #129 into master will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #129      +/-   ##
============================================
+ Coverage     97.92%   98.01%   +0.09%     
- Complexity       69       72       +3     
============================================
  Files            12       12              
  Lines           193      202       +9     
============================================
+ Hits            189      198       +9     
  Misses            4        4              

Impacted Files	Coverage Δ	Complexity Δ
src/EntityDefinition.php	100.00% <ø> (ø)	4.00 <0.00> (ø)
src/FieldDefinition.php	100.00% <100.00%> (ø)	8.00 <8.00> (+2.00)
src/FixtureFactory.php	98.09% <100.00%> (+0.07%)	38.00 <0.00> (+1.00)

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