[Enhancement][Launcher][iOS] ability to set PresentationSourceBounds

[dimonovdd]

Summary

Now we have this code:

var rect = DeviceInfo.Idiom == DeviceIdiom.Tablet
    ? new CGRect(new CGPoint(view.Bounds.Width / 2, view.Bounds.Height), CGRect.Empty.Size)
    : view.Bounds;
documentController.PresentOpenInMenu(rect, view, true);

It would be nice to get behavior as "Share"

if (request.PresentationSourceBounds != Rectangle.Empty || Platform.HasOSVersion(13, 0))
    activityController.PopoverPresentationController.SourceRect = request.PresentationSourceBounds.ToPlatformRectangle();