Flag for enabling sound uri with vibration resource in notification channel

There is a sub-feature (channel notification) for the feature of haptic customization in notification.
This flag is introduced to the sub-feature.

Flag: com.android.server.notification.notification_vibration_in_sound_uri_for_channel
Test: manual test
Bug: 351975435
Change-Id: Idac7240df915ffe41533ae136d03f31a8d290cf7