feat(Panel, Tree, CheckTree): add support for scrollShadow

[simonguo]

Scroll shadows are such nice UX. When a container is scrolled down, you can see a shadow at the top, which makes it clear you can scroll back up. And if it’s possible to scroll down, there is a shadow down there also, unless you’ve scrolled down all the way.

https://rsuite-nextjs-git-feat-panel-scroll-shadow-rsuite.vercel.app/components/panel/#scroll-shadows

<Panel scrollShadow >
...
</Panel>

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Codecov Report

Attention: Patch coverage is 95.48387% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 94.25%. Comparing base (5f3d1a1) to head (da03afb).

Files	Patch %	Lines
src/internals/ScrollView/hooks/useScrollState.ts	86.20%	3 Missing and 1 partial ⚠️
src/Panel/Panel.tsx	83.33%	0 Missing and 1 partial ⚠️
src/Panel/hooks/useExpanded.ts	93.33%	0 Missing and 1 partial ⚠️
src/internals/Windowing/List.tsx	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3818    +/-   ##
========================================
  Coverage   94.24%   94.25%            
========================================
  Files         709      715     +6     
  Lines       23312    23413   +101     
  Branches     3106     3119    +13     
========================================
+ Hits        21971    22067    +96     
- Misses        672      675     +3     
- Partials      669      671     +2     

Flag	Coverage Δ
ChromeCi	94.20% <95.48%> (+<0.01%)	⬆️
Firefox	93.68% <95.48%> (+<0.01%)	⬆️

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