refactor: update the Scrollable component

[wewoor]

Description

重构 Scrollable 组件

Changes

• 新增 thumbStyle 属性，默认滚动条 border 为 0
• 针对 className isShowShadow thumbStyle trackStyle 自定义属性添加单元测试
• 代码可读性优化

忽略Scrollable 部分原生逻辑测试

[codecov]

Codecov Report

Merging #380 (5d64332) into main (facc68a) will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #380      +/-   ##
==========================================
+ Coverage   65.83%   66.04%   +0.21%     
==========================================
  Files         176      176              
  Lines        4768     4780      +12     
  Branches     1030     1031       +1     
==========================================
+ Hits         3139     3157      +18     
+ Misses       1610     1604       -6     
  Partials       19       19              

Impacted Files	Coverage Δ
src/components/scrollable/index.tsx	100.00% <100.00%> (+13.33%)	⬆️
test/utils.ts	100.00% <0.00%> (ø)
...c/services/workbench/explorer/editorTreeService.ts	100.00% <0.00%> (+10.00%)	⬆️

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[mortalYoung]

+1