Simple method of setting a DataGrid column position

[knstvk]

Needed when programmatically adding columns with custom renderers.

For example:

public class DataGrid<E> ...
  
  public void setColumnPosition(Column<E> column, int position) {
      List<Column<E>> columns = new ArrayList<>(getColumns());
      columns.remove(column);
      columns.add(0, column);
      setColumnOrder(columns);
  }