Allow loading of already instantiated EntityDefinitionProviders

[abenerd]

When using factory-bot in a framework one might want to use additional dependencies in their DefinitionProviders, allowing already instantiated providers to be loaded allows the framework to inject the required dependencies before passing the provider to the FixtureFactory.

[ergebnis-bot]

Since this issue has not had any activity within the last 180 days, I have marked it as stale.

I will close it if no further activity occurs within the next 14 days.

[localheinz]

@abenerd

I'll work on this next, definitely need this in a few projects.

[localheinz]

/cc @alexmart

[ergebnis-bot]

Since this issue has not had any activity within the last 180 days, I have marked it as stale.

I will close it if no further activity occurs within the next 14 days.