MouseButtonEventType: missing event for Mouse wheel button press and release

[FrancoTonutti]

When I press or release the mouse wheel button I get an event of type "leftButtonDown", I think it is necessary to have events for this button.

//hid_listener_types.dart

enum MouseButtonEventType {
  leftButtonUp,
  leftButtonDown,
  rightButtonUp,
  rightButtonDown,

  wheelButtonUp,
  wheelButtonDown
}