feat(layout): sider token 增加 colorBgElevated

[sushi-su]

#6131 默认的背景色不能覆盖绝大多数场景，应允许开发者自行配置

[github-actions]

🎊 PR Preview has been successfully built and deployed to https://pro-components-preview-pr-6384.surge.sh

[codecov]

Codecov Report

Base: 99.16% // Head: 99.16% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (e523dd9) compared to base (d3292f6).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6384   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
=======================================
  Files         316      316           
  Lines        9818     9820    +2     
  Branches     3308     3310    +2     
=======================================
+ Hits         9736     9738    +2     
  Misses         72       72           
  Partials       10       10           

Impacted Files	Coverage Δ
packages/provider/src/typing/layoutToken.ts	100.00% <ø> (ø)
...ages/layout/src/components/SiderMenu/SiderMenu.tsx	100.00% <100.00%> (ø)

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