drag-drop: make CdkDragEnd private property _activeTransform.x & y public

[ravikumarbggit]

Please describe the feature you would like to request.

I need to find out what is the transformation of the element along the x axis/ y axis on Drag End so that I can trigger some action. I can get that from _activeTransform.x but it is not accessible as it is private

What is the use-case or motivation for this proposal?

I'm trying to build swipe left and right of list and I need to find out how far element has been dragged so that I can delete element based on percentage of drag

Is there anything else we should know?