Expose cropping overlay and handles with callbacks

[jlasic]

Hey, can you expose cropping overlay with handles so it can be used for any composable component? It could be a modifier or compose component which takes content over which to draw.

For example, I want to implement video cropper, and I would like to wrap your cropper UI over the existing video surface, and would like to get the state of the cropper; width, height, startX & startY so I can proceed with video processing.