Add a new empty settings page, which is flag-guarded. When the flag
is disabled, show the original Notifications on lock screen
tri-state switch, otherwise show the new page.
Bug: 367455695
Flag: com.android.server.notification.notification_lock_screen_settings
Test: atest LockScreenNotificationsPreferenceControllerTest
Change-Id: I8a81ad651626f39380767b2c9cfa2f1c19d0e7c5
Show the Tangor unseen notification toggle in the Notification settings when
notification_minimalism flag is enabled on both phones and large screen devices.
Bug: 330387368
Bug: 354047572
Flag: com.android.server.notification.notification_minimalism
Test: atest ShowOnlyUnseenNotificationsOnLockscreenPreferenceControllerTest
Change-Id: Ic126b7885eb29897b55c4acdc1a2f73b4bc7841e
Test: manual
1. adb shell settings put secure \
lock_screen_show_only_unseen_notifications <0|1>
2. Settings > Notifications > General > Show only new notifications on
lock screen
3. Toggle setting
Observe: if setting is enabled, seen notifications are filtered from
the lockscreen, and vice versa
Bug: 254647461
Change-Id: I4f6e35a1d918095cea25a97f72ddd08869ad9b31
