Needs support for advance custom pointer gestures

[dr1rrb]

Feature request

We should be able to emulate advance pointer gestures, with multiple pointers at once, and also have to ability to run check while pointer are pressed.

Current behavior

We only have some pre-baked gesture / pointer manipulations like "Drag and drop", "pinch", etc.

Expected behavior

We should be able to:

• Select the pointer type
• Control each pointer individually, including its location and its pressed state
• Be able to take a screenshot or run some checks while a pointer is pressed

Minimal reproduction of the problem with instructions

https://github.com/unoplatform/uno/pull/2496/files/8d9e491df98abf9d8420c145918d7d10fdffec61#diff-0d9db92fc7555ca8b9e81df6d0cf3ac3

Environment

Package Version(s): _current_
Visual Studio: _irrelevant_

[davidjohnoliver]

It should also be possible to hold in one place before beginning a drag, to support testing drag-and-drop on touch platforms.