@Override
  public ClusterSchemaTree fetchDeviceSchema(
      PathPatternTree patternTree, PathPatternTree authorityScope) throws MetadataException {
    return mtree.fetchDeviceSchema(patternTree, authorityScope);
  }
Get device node, if the schema region is not set, create it when autoCreateSchema is true

<p>(we develop this method as we need to get the node's lock after we get the lock.writeLock())

@param path path
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/impl/SchemaRegionPBTreeImpl.java