The new `UICollectionViewCompositionalLayout` is really cool but from what I understand you are still limited to a linear layout, though it may be complex.
What I'm trying to achive is something where cells overlap. Something like this:
I suspect I have to use `NSCollectionLayoutGroup.custom(layoutSize:)` but I see no documentation for this at all not to mention any examples.
Any clues how can I do this?