Add ability to show/hide items for Special Access.

This adds five new boolean flags:
config_show_high_power_apps
config_show_device_administrators
config_show_premium_sms
config_show_data_saver
config_show_enabled_vr_listeners

Which when individually set to false, will hide the respectively item
from "Special Access" in Apps & notifications. It will also hide them
from surfacing in search results.

Bug: 70907131
Test: Updated SpecialAccessSettingsTest, and created:
HighPowerAppsControllerTest
DeviceAdministratorsControllerTest
PremiumSmsControllerTest
DataSaverControllerTest
EnabledVrListenersControllerTest

Change-Id: I5ad58755643e71d4fb71774404ad96c127440ae4