joseraul has created Issue #1651: whereColumn feature missing in laravel-mongodb

Issue Text:
Hi!

I think is not possible to use the `whereColumn`, right?
Is there any special reason because it is not implemented?
I will be happy to help

Adding a use case for whereColumn.
We recalculate items every day that is within the period (date_first_in_period, date_last_in_period).

      
$builder = BenchmarkCacheModel::query()
            ->where('filter_alias', $filterAlias)
            ->whereColumn('date_last_in_period', '>=', 'updated_at');
        $keyItemArray = $builder->get()->toArray();

 
Unfortunately this does not work since whereColumn is not implemented: "BadMethodCallException: This method is not supported by MongoDB"

MongoDb itself can do this with aggregations. I will have to solve this for now with a raw call.