@Override
  public UnkeyedTable originalTable() {
    return table;
  }
build an amoro table implement which table format is iceberg.

@param identifier table identifier.
@param icebergTable iceberg table
@param metaStore auth context
@param catalogProperties catalog properties.
@return amoro table.
amoro-format-iceberg/src/main/java/org/apache/amoro/formats/iceberg/IcebergTable.java