Introduce property to configure Notification forwarding

Relates to #95 (closed) Introduce a new optional property in application.properties that allows to disable Notification forwarding, i.e. triggering notify() in NotificationController see https://git.openlogisticsfoundation.org/digital-air-cargo/ne-one/-/blob/6be4c61f05d7c61ac147ddbb7156dc5d28a696f0/src/main/java/org/openlogisticsfoundation/neone/controller/NotificationController.java#L51

enable_notification_forwarding=false

Default should be false