[libinput] Add natural scrolling support

Wraps libinput
libinput_device_config_has_natural_scroll
libinput_device_config_set_natural_scroll_enabled
libinput_device_config_get_natural_scroll_enabled
libinput_device_config_scroll_get_default_natural_scroll_enabled

Differential Revision: https://phabricator.kde.org/D3193
BUG: 371791
FIXED-IN: 5.8.4