perf: Optimize CssSizeLength & CssStyleBuilder

[LeaFrock]

🤔 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?)

🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Optimize CssSizeLength & CssStyleBuilder
🇨🇳 Chinese	优化CssSizeLength 和CssStyleBuilder

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

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

[github-actions]

[codecov]

Codecov Report

Base: 41.59% // Head: 40.20% // Decreases project coverage by -1.38% ⚠️

Coverage data is based on head (f842b40) compared to base (7ff7f0e).
Patch coverage: 90.47% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2803      +/-   ##
==========================================
- Coverage   41.59%   40.20%   -1.39%     
==========================================
  Files         544      544              
  Lines       25713    25739      +26     
  Branches      260      260              
==========================================
- Hits        10695    10349     -346     
- Misses      14978    15350     +372     
  Partials       40       40              

Impacted Files	Coverage Δ
components/table/ColumnBase.cs	0.00% <0.00%> (ø)
components/core/Helpers/CssStyleBuilder.cs	88.23% <88.23%> (+88.23%)	⬆️
components/core/CssSizeLength.cs	85.00% <97.67%> (-1.37%)	⬇️
components/list/ListItemLayout.cs	0.00% <0.00%> (-100.00%)	⬇️
components/list/ListItem.razor	0.00% <0.00%> (-95.31%)	⬇️
components/list/AntList.razor	0.00% <0.00%> (-92.31%)	⬇️
...omponents/form/Validate/Rule/FormRulesValidator.cs	0.00% <0.00%> (-76.93%)	⬇️
components/list/AntList.razor.cs	0.00% <0.00%> (-76.12%)	⬇️
components/list/ListItem.razor.cs	0.00% <0.00%> (-73.08%)	⬇️
components/form/Form.razor.cs	36.02% <0.00%> (-32.30%)	⬇️
... and 14 more

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