Forget with collections

[joelbutcher]

Resolves #47571

Allows developers to pass a collection of keys to Collection::forget() instead of requiring them to call ->toArray() beforehand.

Before

/** @var Collection $keysToForget */
$keysToForget = $this->getKeysToForget();

return $collection->forget($keysToForget->toArray());

Now

/** @var Collection $keysToForget */
$keysToForget = $this->getKeysToForget();

return $collection->forget($keysToForget);