Can dataZoom slider only use left or right handler? dataZoom可以仅使用一侧的滑动手柄, 另一侧保持固定吗?

### What problem does this feature solve?
dataZoom在坐标轴缩放时, 希望有能保持一侧固定的功能, 仅另一侧缩放.

### What does the proposed API look like?
```js
dataZoom: [
{
type: 'slider',
handler: 'left' | 'right' | 'both', // default 'both'
}
],
```