Bind action to fragment: adaptive notif settings

Bug: 330608738

Test: send high pri HUN => see edu HUN from sysui
      tap HUN/action => shows adaptive notif settings page,
                        notif menu key highlighted in split screen

Test: adb shell am start-activity -a android.settings.MANAGE_ADAPTIVE_NOTIFICATIONS

Flag: com.android.systemui.notification_avalanche_throttle_hun

Change-Id: I8bc36412b6ce6364887b04d737310e6b01478964
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index e3bb1a1..24d9525 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -303,6 +303,7 @@
     public static class UserSettingsActivity extends SettingsActivity { /* empty */ }
     public static class NotificationAccessSettingsActivity extends SettingsActivity { /* empty */ }
     public static class NotificationAccessDetailsActivity extends SettingsActivity { /* empty */ }
+    public static class ManageAdaptiveNotificationsActivity extends SettingsActivity { /* empty */ }
     public static class VrListenersSettingsActivity extends SettingsActivity { /* empty */ }
     public static class PremiumSmsAccessActivity extends SettingsActivity { /* empty */ }
     public static class PictureInPictureSettingsActivity extends SettingsActivity { /* empty */ }