public State(
	IImmutableDictionary<string, IActorRef> shards,
	IImmutableDictionary<IActorRef, IImmutableList<string>> regions,
	IImmutableSet<IActorRef> regionProxies,
	IImmutableSet<string> unallocatedShards
)

new : 
        shards : IImmutableDictionary<string, IActorRef> * 
        regions : IImmutableDictionary<IActorRef, IImmutableList<string>> * 
        regionProxies : IImmutableSet<IActorRef> * 
        unallocatedShards : IImmutableSet<string> -> State