Interface to hold information about a Carousel item and its size.
Example of CarouselItemInfo usage:
The rect by which the carousel item is being clipped.
The maximum size in the main axis of the carousel item, eg. the size of the item when it is at a focal position
The minimum size in the main axis of the carousel item, eg. the size of the item when it scrolls off the sides of the carousel
The size of the carousel item in the main axis