Support ACTION_NOTIFICATION_ASSISTANT_DETAIL_SETTINGS in Enhanced Notifications

Show detail settings page from the default NAS app if it implements the new intent ACTION_NOTIFICATION_ASSISTANT_DETAIL_SETTINGS.

Test: Robotest, manually test on device
Bug: 231492005
Change-Id: I6566cd9d615331a56728613583295637982bcd3f
Merged-In: I6566cd9d615331a56728613583295637982bcd3f