[Feature] rowSeriesNumber设置拖拽时，希望将位置信息以及原来行数据和目标行数据通过回调函数暴露出来

[zundaren]

What problem does this feature solve?

比如有两行数据，type不一致， 让用户通过拖拽，比如把type=2的拖到type=1上面， 我通过拖拽毁回调强制修改数据。其他的比如文件移动等等都可以自定义实现了。

What does the proposed API look like?

onStart， onDrag, onEnd(oldRow, targetRow, x, y位置，行列 ), 参数尽量全一点

[fangsmile]

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[zundaren]

@onDragSelectEnd="dragSelect"

function dragSelect(e: any) {
  if (e.cells && e.cells.length > 0) {
    let src = e.cells[0][0].originData;
    let targetRow = e.row;
    if (src && targetRow) {
      let target = r_files.value[targetRow - 1];
      dragRow(src, target)
    }
  }

}

目前通过这个方法可以获取到前后移动的元素，但是没有动画效果