As a user of the the library I sometimes find myself wanting to use the collection as an array/list to, for example, sort it.

This usually will look like this:

$collection = new Collection([1,2,3]);
$array = iterator_to_array($collection);
$sorted = usort($array, static fn (int $valueA, int $valueB) => $valueA <=> $valueB);

Or in a case where I want to use the collection as a list of items to, for example, expose it in a symfony controller and want to make sure that it's returned as a list instead of a potential associative array:

$collection = new Collection([1,2,3]);
$list = array_values(iterator_to_array($collection));
return $this->json($list);

Which, in both cases, the library could do internally which is why this PR introduces these functions