Enhancement: Allow registering already instantiated entity definition providers

[localheinz]

This pull request

• allows registering already instantiated entity definition providers

Fixes #503.

[codecov]

Codecov Report

Merging #702 (9f58a31) into main (6043661) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 9f58a31 differs from pull request most recent head f08c837. Consider uploading reports for the commit f08c837 to get more accurate results

@@             Coverage Diff              @@
##               main     #702      +/-   ##
============================================
+ Coverage     98.53%   98.55%   +0.01%     
- Complexity      103      105       +2     
============================================
  Files            25       25              
  Lines           342      345       +3     
============================================
+ Hits            337      340       +3     
  Misses            5        5              

Impacted Files	Coverage Δ
src/FixtureFactory.php	96.75% <100.00%> (+0.06%)	⬆️

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