message: Add public getter for statment return type
diff: @@ -62,6 +62,10 @@ public class DuckDBResultSetMetaData implements ResultSetMetaData {
  protected DuckDBColumnTypeMetaData[] column_types_meta;
  protected final StatementReturnType return_type;
  + public StatementReturnType getReturnType() {
  + return return_type;
  + }
  +
  public int getColumnCount() throws SQLException {
  return column_count;
  }
  