reafctor: Use CSSMotion

[zombieJ]

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[lgtm-com]

This pull request introduces 1 alert when merging faf59eb into 58aab1a - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[codecov]

Codecov Report

Merging #290 into master will decrease coverage by 1.07%.
The diff coverage is 86.95%.

@@            Coverage Diff             @@
##           master     #290      +/-   ##
==========================================
- Coverage   95.05%   93.97%   -1.08%     
==========================================
  Files          10       11       +1     
  Lines         788      797       +9     
  Branches      230      233       +3     
==========================================
  Hits          749      749              
- Misses         39       48       +9

Impacted Files	Coverage Δ
src/util.ts	95.45% <ø> (ø)	⬆️
src/DOMWrap.tsx	84.96% <ø> (-0.23%)	⬇️
src/Menu.tsx	90.69% <100%> (-6.93%)	⬇️
src/SubMenu.tsx	97.91% <100%> (-0.05%)	⬇️
src/SubPopupMenu.tsx	95.18% <66.66%> (-1.14%)	⬇️
src/utils/legacyUtil.ts	90% <90%> (ø)

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[zombieJ]

https://github.com/react-component/menu/pull/290/files#diff-6a815b35e7450c06c65064575bb218bdR193
内部通过 shouldComponentUpdate 判断是否跳过更新，而外部的 SubMenu 和 Animate 都通过直接设置 DOM style 更新动画，加了一些判断条件，但是感觉会有坑 😂