AppClone: Add preference to display new page Cloned Apps

Also adds a faeture flag and controller class for this page.
UX path: Apps > Cloned Apps

Bug: 249916503
Bug: 248235441
Test: manual
Test: make RunSettingsRoboTests -j30 ROBOTEST_FILTER=AppsPreferenceControllerTest
Test: make RunSettingsRoboTests -j30 ROBOTEST_FILTER=ClonedAppsPreferenceControllerTest
Change-Id: I2f68f4365ce08481c7db7bfdda4fdffc369321a9