希望可以添加倒计时组件 count down

[daimashangchuan]

This function solves the problem (这个功能解决的问题)

货品可以在倒计时后自动上架（Products can be automatically put on the shelves after the countdown ）......

Expected API (期望的 API)

format 格式化倒计时展示，moment HH:mm:ss
prefix 设置数值的前缀 VNodeChild
suffix 设置数值的后缀 VNodeChild
title 数值的标题 VNodeChild
value 数值内容 number | moment
valueStyle 设置数值的样式 CSSProperties
onFinish 倒计时完成时触发 () => void
onChange 倒计时时间变化时触发 (value: number) => void

[Sepush]

repeat with #1465

I am working on it recently and it will come soon.