Kernel/HID: Introduce the all-mice device

This device will be used by userspace to read mouse packets from all
mouse devices that are attached to the machine.

This change is a preparation before we can enable seamless hotplug
capabilities in WindowServer for mouse devices, without any major change
on the userspace side.

Kernel/Devices/HID/MouseDevice.cpp

@@ -23,6 +23,7 @@ MouseDevice::MouseDevice()
 void MouseDevice::handle_mouse_packet_input_event(MousePacket packet)
 {
     m_entropy_source.add_random_event(packet);
+    HIDManagement::the().enqueue_mouse_packet({}, packet);
     {
         SpinlockLocker lock(m_queue_lock);
         m_queue.enqueue(packet);