[Feature Request] Add closure sorting

[CrazyBoy49z]

Feature Request

Summary

Brief description of what is at stake.

Why is this needed?

 Column::add()
                ->title('Full name')
                ->field('full_name')
                ->sortable(function($query) => {
           return $query->sortBy('first_name)->sortBy('last_name');
        });
}),

Suggested Solution(s)

Excellent and easy sorting management