fix: cascader group border

[iahu]

• cascader
  • group-name 改为 sticky 样式
  • aria-expanded 元素高亮
  • 拆分 less 文件
• website
  • 修复 icons 名称问题

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/growingio/gio-design/4ec4wyezh
✅ Preview: https://gio-design-git-fork-iahu-fix-cascader-group-border.growingio.vercel.app

[codecov]

Codecov Report

Merging #660 (9b0e006) into master (f44a6ba) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #660      +/-   ##
==========================================
+ Coverage   82.52%   82.57%   +0.04%     
==========================================
  Files         130      130              
  Lines        4384     4385       +1     
  Branches     1161     1160       -1     
==========================================
+ Hits         3618     3621       +3     
+ Misses        762      760       -2     
  Partials        4        4              

Impacted Files	Coverage Δ
...components/src/components/cascader/single-menu.tsx	95.08% <100.00%> (+3.27%)	⬆️
...s/components/src/components/modal/CalloutModal.tsx	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f44a6ba...faf12bd. Read the comment docs.