Factory create related model without execute

[kassah]

With factories, I want to be able to create related children models without having to utilize execute after creation.

This allows something that looks like this:

$tenants = Tenant::factory()->count(2)->hasFidgets(2)->create();

where Fidget's are within a tenant's database.

With this idea in place, this would create 2 tenants with two fidget's each with the factory knowing exactly when to utilize execute so that the creation of the fidget was done within a Tenant->execute callback.

I currently have code with tests for this. The question here is, is there interest in seeing a PR of this?