[9.x] Support iterables objects on data_get nested arrays

[marcoocram]

Using data_get helper to get properties on nested arrays is only available if the object is an array or Collection.

This PR allows to get data from any "iterable" object.

Example:

class IterableObject implements IteratorAggregate
{
    protected $items = [];

    public function __construct($items = [])
    {
        $this->items = $items;
    }

    public function getIterator()
    {
        return new ArrayIterator($this->items);
    }
}

$object = new IterableObject([
    ['data' => 'hello'],
    ['data' => 'world'],
]);

data_get($object, '*.data');
// ["hello", "world"]

[taylorotwell]

Why on master? What is the breaking change?

[marcoocram]

I don't think this will be a BC, but you revert the PR on 8.x branch because risk of change (on existing projects) so maybe this could be the BC...

#37443 (comment)