Add to cdkDropList events data about keyboard with pressed control keys

[Dok11]

Feature Description

<div cdkDropList (cdkDropListDropped)="drop($event)">
I want get in $event data about pressed keys like Alt, Ctrl or Shift for example.

Use Case

For different behaviour and more various UI/UX scenarios with keyboard participio.

[crisbeto]

Not exactly what was requested here, but #17077 will expose the native MouseEvent that triggered the dropping. From it you can get which key is pressed using event.ctrlKey or event.altKey.