feat: add whitespace validator

[PengYYYYY]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

💡 需求背景和解决方案

📝 更新日志

• feat(Form): 添加内置校验方法 whitespace

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

[codecov-commenter]

Codecov Report

Merging #1011 (c9f2445) into develop (8fdcb64) will decrease coverage by 0.42%.
The diff coverage is 47.75%.

@@             Coverage Diff             @@
##           develop    #1011      +/-   ##
===========================================
- Coverage    60.81%   60.39%   -0.43%     
===========================================
  Files          914      943      +29     
  Lines        15385    16542    +1157     
  Branches      3467     3754     +287     
===========================================
+ Hits          9357     9991     +634     
- Misses        6028     6551     +523     

Impacted Files	Coverage Δ
src/_util/callBoth.ts	0.00% <ø> (ø)
src/_util/dom.ts	42.59% <0.00%> (+1.85%)	⬆️
src/alert/_example/base.jsx	100.00% <ø> (ø)
src/alert/_example/close.jsx	100.00% <ø> (ø)
src/alert/_example/icon.jsx	100.00% <ø> (ø)
src/alert/_example/operation.jsx	100.00% <ø> (ø)
src/alert/_example/swiper.jsx	100.00% <ø> (ø)
src/avatar/_example/adjust.jsx	100.00% <ø> (ø)
src/avatar/_example/base.jsx	100.00% <ø> (ø)
src/avatar/_example/group-cascading.jsx	100.00% <ø> (ø)
... and 395 more

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