[iOS] Drag and Drop Request Full-Size Previews

[tj-devel709]

Description

On iOS, when you drag and drop an item, the drag preview is resized smaller. Although the Drag and Drop Platform Event Args are now exposed, there doesn't seem to be a way to keep the system from resizing these elements and is a problem for customers who require custom functionality.

Public API Changes

DragEventArgs.PlatformArgs.SetPrefersFullSizePreviews((interaction, session) => { return true; });

Intended Use-Case

I have a collectionview and want to drag cells for custom functionality but they keep on being resized automatically.