add a draggable list item demo

[charset]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• Bundle size optimization
• Performance optimization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

💡 Background and solution

By adding a div element in ListItem and setting draggable='true' and providing some ondragover/ondragstart/ondrop envent handlers to simple list making the list items can be dragged and dropped to arrange the list sequence.

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided
• Demo is updated/provided
• Changelog is not needed

[github-actions]

[codecov]

Codecov Report

Merging #2563 (164ed73) into master (a935863) will increase coverage by 2.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2563      +/-   ##
==========================================
+ Coverage   27.62%   29.64%   +2.02%     
==========================================
  Files         497      520      +23     
  Lines       33450    25635    -7815     
  Branches        0      250     +250     
==========================================
- Hits         9239     7600    -1639     
+ Misses      24211    17995    -6216     
- Partials        0       40      +40     

Impacted Files	Coverage Δ
components/core/Helpers/MemberPath/PathNode.cs	46.15% <0.00%> (-8.85%)	⬇️
components/core/Reflection/TypeDefined.cs	77.77% <0.00%> (-7.94%)	⬇️
components/input/InputGroup.razor.cs	87.50% <0.00%> (-6.95%)	⬇️
...ponents/date-picker/types/DatePickerPlaceholder.cs	22.72% <0.00%> (-4.20%)	⬇️
...ponents/core/Component/Overlay/type/TriggerType.cs	81.25% <0.00%> (-2.97%)	⬇️
components/core/Helpers/DateHelper.cs	80.00% <0.00%> (-2.71%)	⬇️
...onents/date-picker/internal/DatePickerHeader.razor	43.90% <0.00%> (-2.48%)	⬇️
components/menu/SubMenu.razor	63.93% <0.00%> (-2.30%)	⬇️
components/timeline/Timeline.razor.cs	63.21% <0.00%> (-2.24%)	⬇️
components/core/Helpers/THelper.cs	36.00% <0.00%> (-1.78%)	⬇️
... and 424 more

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