feat(cdk:scroll): show scrollbar when mouseenter

[danranVm]

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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

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What kind of change does this PR introduce?

• Bugfix
• Feature
• Component style update
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
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[idux-bot]

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[codecov]

Codecov Report

Merging #722 (c323915) into main (8b5212b) will decrease coverage by 0.07%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##             main     #722      +/-   ##
==========================================
- Coverage   85.38%   85.30%   -0.08%     
==========================================
  Files         397      397              
  Lines       10079    10087       +8     
  Branches     2339     2343       +4     
==========================================
- Hits         8606     8605       -1     
- Misses       1473     1482       +9     

Impacted Files	Coverage Δ
.../cdk/scroll/src/virtual/composables/useScrollTo.ts	86.20% <0.00%> (ø)
packages/cdk/scroll/src/virtual/VirtualScroll.tsx	88.09% <70.58%> (-11.91%)	⬇️
...scroll/src/virtual/composables/useScrollVisible.ts	100.00% <100.00%> (ø)
...ages/cdk/scroll/src/virtual/contents/ScrollBar.tsx	96.42% <100.00%> (ø)
...ponents/image/src/component/ImageViewerContent.tsx	86.20% <0.00%> (-3.45%)	⬇️

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