protected ConfigNodeRPCServiceProcessor getConfigNodeRPCServiceProcessor() {
    return new ConfigNodeRPCServiceProcessor(configManager);
  }
Register Non-seed {@link ConfigNode} when first startup.

@throws StartupException if register failed.
@throws IOException if {@link ConsensusManager} init failed.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/service/ConfigNode.java