[bugfix] Collapse: use double raf to ensure animation can start

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #3723 into dev will decrease coverage by 0.03%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##              dev    #3723      +/-   ##
==========================================
- Coverage   93.21%   93.17%   -0.04%     
==========================================
  Files         124      124              
  Lines        2696     2697       +1     
  Branches      248      248              
==========================================
  Hits         2513     2513              
- Misses        151      152       +1     
  Partials       32       32

Impacted Files	Coverage Δ
src/collapse-item/index.js	82.97% <50%> (-1.81%)	⬇️

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[parrot-designa]

I want kown why double raf can animation