feat: pointer API

[ph-fritsche]

Create an abstract pointer API that handles the state of pointer devices. See #714
It shall be used to internally replace our implementations of pointer related APIs.

• Press and release mouse buttons
  This should be analog to the keyboard implementation.

  const pointerState = user.pointer('[MouseLeft>]')
  user.pointer('[/MouseLeft]', {pointerState})

• Move the pointer
  This will be limited by the fact that our primary target environment jsdom has no layout.
  But like we already support hover we should add the option to
  • Move the pointer from one element to another.
    This should trigger the appropriate leave and enter events on the related targets.
    This will neglect that we do not know the layout relation between those elements, i.e. if the elements will be rendered beside each other and moving the pointer will therefore be possible or if one renders over the other or outside of the viewport.
    This will also neglect any other elements that might render between the two elements and therefore would also receive pointer events in a browser environment.
  • Move the pointer to specified coordinates on the element.
    As for moving the pointer from one element to another, testing this with userEvent can not give confidence that the layout allows such movement. But it can be used to ensure that event handlers are correctly wired and work in principle.