RegisterCommand register a decoder for the given command and message pair MT is the message type (ex: cmd_pb.CreateServiceCommand) CT is the command type (ex: CreateServiceCommand) M is the CommandMsg/command.TypedMessage implementation (ex: *cmd_pb.CreateServiceCommand) C is the decodableCommand/command.Command implementation (ex: *CreateServiceCommand) We only have both types specified so that we can enforce that each is a pointer type.

CommandMsg is a TypedMessage which is also a pointer type.

Config provides the values needed to create a Network instance.