* feat: add builder and relation generics

* Update src/Illuminate/Auth/EloquentUserProvider.php

Co-authored-by: Jonas Staudenmeir <mail@jonas-staudenmeir.de>

* test: add additional type tests

* feat: create HasBuilder trait

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Co-authored-by: Dries Vints <dries@vints.be>
Co-authored-by: Jonas Staudenmeir <mail@jonas-staudenmeir.de>