[Discussion] drop the unnecessary conformance for the carousel and grid component.

[royhsu]

It seems like these two component types only contain index instead of indexPath property.

For example,

// Replace the CollectionComponent protocol.
class CarouselComponent: CollectionComponent { ... }

// With the Component protocol
class CarouselComponent: Component { ... }

[royhsu]

Or define a new protocol

protocol ArrayComponent: Component {

    func numberOfItemComponents: Int { get }

    func setItemComponent(
        provider: (
            _ component: Component,
            _ index: Int
        )
        -> Component
    )

}