Screenshots:
* The new setting: http://shortn/_9JL6nMS3cR
* The disabled "Learn touchpad gestures" button and accompanying footer
when the setting is off: http://shortn/_FTcNTQAGYj
Test: disable the setting, check three- and four-finger swipes on the
touchpad stop working; re-enable, check they work again
Test: check the toggle and heading both hide correctly when flag is off
or no touchpad is connected
Test: check the "Learn touchpad gestures" button is disabled with an
explanation when gestures are disabled
Bug: 353947750
Bug: 374965372
Flag: com.android.hardware.input.touchpad_system_gesture_disable
Change-Id: Ie7a6ea4e9ddd34710d07f78ab96598207aac4228
1. rename TrackpadSetting to TouchpadAndMouseSetting
to match more about usage.
2. Add separated pages for touchpad and mouse.
Gather options from current page and put it accordingly.
Please note that this change only add isolate files for pages
and didn't reference from anywhere, it will be done in next change.
This is part of feature for keyboard setting update.
document: go/new-a11y-touchpad-mouse-page
Bug: 377602364
Test: atest SettingsRoboTests
Flag: com.android.settings.keyboard.keyboard_and_touchpad_a11y_new_page_enabled
Change-Id: I9e18ce3fbc3617bfb6cef3c272f3cfcfd2ff8a37
