iOS: External mouse event is not collect

When using a mouse connected to an iPad, some events are incorrect:

• Mouse move event without button (mouseTracking) is not supported
• When some mouse button is pressed, events occur, but they are all for the left button

Currently, the Qt event system for iOS does not distinguish between mouse events and touch events, but treats them all as touch events, and the touch events are converted to left button drags by mouse emulation, which is why this behavior occurs.

It is related to QTBUG-99795, but now the wheel event is handled correctly and scrolling seems to work.