public RootGuardianSupervisor(
	RootActorPath root,
	IActorRefProvider provider,
	TaskCompletionSource<Status> terminationPromise,
	ILoggingAdapter log
)

new : 
        root : RootActorPath * 
        provider : IActorRefProvider * 
        terminationPromise : TaskCompletionSource<Status> * 
        log : ILoggingAdapter -> RootGuardianSupervisor