feat(cdk:utils): add zIndex manager

[brenner8023]

FIXED: #998

PR Checklist

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• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

弹窗重叠时没有把zIndex加一

What is the new behavior?

modal会自动计算z-index, 后出现的弹窗会在前一个弹窗的基础上 z-index + 1

Other information

[idux-bot]

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[codecov]

Codecov Report

Merging #1015 (00076ad) into main (32e48d8) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1015      +/-   ##
==========================================
+ Coverage   93.73%   93.75%   +0.01%     
==========================================
  Files         313      314       +1     
  Lines       29922    29987      +65     
  Branches     3537     3540       +3     
==========================================
+ Hits        28048    28113      +65     
  Misses       1874     1874              

Impacted Files	Coverage Δ
packages/cdk/utils/src/zIndex.ts	100.00% <100.00%> (ø)
...ckages/components/_private/overlay/src/Overlay.tsx	97.17% <100.00%> (+0.11%)	⬆️
packages/components/config/src/defaultConfig.ts	100.00% <100.00%> (ø)
packages/components/config/src/types.ts	100.00% <100.00%> (ø)
packages/components/drawer/src/Drawer.tsx	94.91% <100.00%> (+0.02%)	⬆️
packages/components/drawer/src/DrawerWrapper.tsx	83.84% <100.00%> (ø)
packages/components/drawer/src/token.ts	100.00% <100.00%> (ø)
packages/components/modal/src/Modal.tsx	99.40% <100.00%> (+0.04%)	⬆️
packages/components/modal/src/ModalWrapper.tsx	81.00% <100.00%> (ø)
packages/components/modal/src/token.ts	100.00% <100.00%> (ø)

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[danranVm]

销毁后，zIndex 不重置了？

[brenner8023]

销毁后，zIndex 不重置了？

重置zIndex需要维护一份element的缓存，维护缓存会增加代码的负担。zIndex累加，从1000加到9999需要页面交互操作8999次，容错的数据足够大，理论上不会出现什么超过9999、超过zIndex最大值的问题。