[11.x] Add multiply to collection

[patrickomeara]

When I'm building UIs I usually want to know what the layout will look like if there is a lot of things. I am constantly doing something like this for strings:

<div>
  {{ $user->name }} 
  {{ $user->name }} 
  {{ $user->name }} 
  {{ $user->name }}
</div>

But when it comes to collections things get a little more difficult.

@foreach($class->students as $student)
   <x-student :student="$student" />
@endforeach

I've had this method in a macro for quite some time and thought it might be useful for others.

@foreach($class->students->multiply(4) as $student)
   <x-student :student="$student" />
@endforeach