Shorthand trait to use the builder from a model

[smokills]

Hello! During my experience with this amazing package, I came out with a trait that lets you configure the Builder behavior from within the desired model. So, for example, you can configure all related filters, includes, etc from the model, and then use it in this way (typically in a controller):

// Somewhere in a controller
User::requestBuilder($request)->paginate()

I was dubious if open a PR, or simply release a simple trait as a "package"