Fix: Compose meta data instead of entity manager

[localheinz]

This PR

• composes class meta data instead of the entity manager into EntityDef

Follows #1.

[codecov]

Codecov Report

Merging #50 into master will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #50      +/-   ##
============================================
+ Coverage     92.85%   92.89%   +0.03%     
  Complexity       81       81              
============================================
  Files             8        8              
  Lines           196      197       +1     
============================================
+ Hits            182      183       +1     
  Misses           14       14              

Impacted Files	Coverage Δ	Complexity Δ
src/EntityDef.php	90.90% <100.00%> (ø)	18.00 <1.00> (ø)
src/FixtureFactory.php	91.66% <100.00%> (+0.10%)	37.00 <0.00> (ø)

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