Introduce hid_open and hid_close events

This allows to handle HID open/close reports at the same place as HID
input reports (in the HID layer).

This will be especially useful to manage HID gamepads, to avoid
implementing one part in the HID layer and another part in the gamepad
processor implementation.

PR #5270 <https://github.com/Genymobile/scrcpy/pull/5270>