[10.x] Introduce new Arr::take() helper

[ryangjchandler]

I reached for this today and could have sworn that it existed, but turns out that it's only a Collection method. I think it makes sense as an Arr helper too, since it reads a lot nicer than the underlying array_slice() syntax.

[taylorotwell]

I don't see a limit collection method?

[ryangjchandler]

Ah, yeah not limit(), take() is the correct method name inside of Collection.

I can rename for consistency with the collection method, if preferred?

[taylorotwell]

Yeah I think that would be good.

[ryangjchandler]

@taylorotwell All done :^)

[taylorotwell]

Thanks!

[decadence]

Note: this doesn't preserve array keys while Collection::take does