Register a named entity type `ShardRegion` on this node that will run in proxy only mode, i.e.it will delegate messages to other `ShardRegion` actors on other nodes, but not host any entity actors itself. The ShardRegion actor for this type can later be retrieved with the ShardRegion(String) method.

Register a named entity type `ShardRegion` on this node that will run in proxy only mode, i.e.it will delegate messages to other `ShardRegion` actors on other nodes, but not host any entity actors itself. The ShardRegion actor for this type can later be retrieved with the ShardRegion(String) method.