[11.x] Feature: Array reject

[liamduckett]

Hey, this PR adds a reject method to the Array helper.

This will allow users to simplify array filtering code like so:

// Declare array
$array = ['Liam Duckett', 'Liam Doe', 'John Doe', 'John Liam'];

// -- Previously --
$liams = Arr::where($array, fn($value) => str_contains($value, 'Liam'));
$notLiams = Arr::where($array, fn($value) => ! str_contains($value, 'Liam'));

// -- With this PR --
$liams = Arr::where($array, fn($value) => str_contains($value, 'Liam'));
$notLiams = Arr::reject($array, fn($value) => str_contains($value, 'Liam'));

This also brings it more aligned with Collections which already have a reject method. I also thought about adding an alias filter for the where method, but decided this was better done in another PR (thoughts welcome)?