Improve action sheet's constraints on collection view for small screens or landscape orientation

Those changes helps to improve interactions on action sheet view when displayed on small screens or landscape, mostly to be able to dismiss the view by enforcing the display of a touchable margin on top of it.

It also enable and displays vertical scroll indicator when appearing or on orientation changes if the items collection container is smaller than its content.

Here are some ui renders on some devices in portrait and landscape

device/os	orientation	display
iPhone 5s/iOS 12.5.4	landscape
iPhone 5s/iOS 12.5.4	portrait
iPhone X/iOS 14.4.2	landscape
iPhone X/iOS 14.4.2	portrait

Closes #944 (closed)