[Feature] 滚动条单独滚轮状态希望支持按固定步长滚动

[zexia-create]

What problem does this feature solve?

https://jsfiddle.net/ghtzvqka/2/ 想要的效果为右侧第四个，目前组件仅支持第三种

以及滚动条的高度应该限制个最小值，目前数据太多，滚动条会缩到看不见

What does the proposed API look like?

1、支持滚轮按固定步长滚动
2、滚动条限制最小高度，防止看不见

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Title: [Feature] The independent scroll wheel state of the scroll bar hopes to support scrolling by a fixed step size.