Add ReadMajorityPlus consistency to DistributedData

[Arkatufus]

Port ReadMajorityPlus consistency from scala Akka to Akka.NET and the required serialize/deserialize code.
The required Protobuff wire format is already added in #4414

https://github.com/akka/akka/blob/master/akka-distributed-data/src/main/scala/akka/cluster/ddata/Replicator.scala#L439-L444
https://github.com/akka/akka/blob/master/akka-distributed-data/src/main/scala/akka/cluster/ddata/protobuf/ReplicatorMessageSerializer.scala#L342-L390

[zbynek001]

i think this is done in #5146

[Aaronontheweb]

Correct!