Added zen settings messages and calls preferences.

- Made ZenModeSettings and ZenModeBehaviorSettings a DashboardFragment
- Switches in ZenModeBehaviorSettings all have their own preference controllers
- Instead of a dropdown, messages & calls have their own pages & preference controllers
- Added basic turn on/off DND button in settings (dialog not yet implemented)

Bug: 63077372
Fixes: 69057767
Test: make -j40 RunSettingsRoboTests
Change-Id: I1c70f77053713f66f873ee578477f23cfd7985bb

tests/robotests/assets/grandfather_not_implementing_indexable

@@ -3,7 +3,6 @@ com.android.settings.deviceinfo.SimStatus
 com.android.settings.deviceinfo.PrivateVolumeForget
 com.android.settings.inputmethod.SpellCheckersSettings
 com.android.settings.inputmethod.KeyboardLayoutPickerFragment
-com.android.settings.notification.ZenModeEventRuleSettings
 com.android.settings.fuelgauge.InactiveApps
 com.android.settings.accessibility.CaptionPropertiesFragment
 com.android.settings.accessibility.AccessibilitySettingsForSetupWizard
@@ -30,7 +29,6 @@ com.android.settings.accounts.ManagedProfileSettings
 com.android.settings.accessibility.ToggleAutoclickPreferenceFragment
 com.android.settings.applications.AppLaunchSettings
 com.android.settings.applications.ProcessStatsUi
-com.android.settings.notification.ZenModeScheduleRuleSettings
 com.android.settings.datausage.BillingCycleSettings
 com.android.settings.notification.NotificationStation
 com.android.settings.print.PrintJobSettingsFragment