Deterministic shuffling of collections during tests

[RVxLab]

Collection::shuffle makes use of the Randomizer class of PHP and instantiates one as needed.

When running tests that make use of this it makes writing tests around it a bit more tedious.

To solve this, I suggest resolving Randomizer using the service container.

public static function shuffle(): array
{
    return app(Randomizer::class)->shuffleArray();
}

If a more gradual approach is wanted, using an alias like arr.randomizer could be an option.

To set the Randomizer, either a manual binding to the class (or alias) can be done, or be creating a new static method to set the Randomizer:

public static function shuffleUsing(Randomizer $randomizer): void
{
    app()->instance(Randomizer::class, $randomizer);
}

public static function shuffleNormally(): void
{
    app()->forgetInstance(Randomizer::class);
}

I’d be happy to provide a PR for this.