Add support for custom EloquentBuilder

[lloricode]

Hi, we saw this feature filtering with scope with model docs v5, and able to use it automatically by same way as route model binding

but we struggle when using custom EloquentBuilder class since we segregate scope's to make model looks snapy

{
    "message": "[redacted]\\ItemEloquentBuilder::whereBranch(): Argument #1 ($branch) must 
    be of type [redacted]\\Branch, string given, 
    called in [redacted]/vendor/spatie/laravel-query-builder/src/Filters/FiltersScope.php on line 43",

hope that you can consider this work with custom eloquent builder, since it helps a lot
thanks for the great package ❤️