[table]列拖动功能优化

[LoopZhou]

🤔 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

Fixes #859

💡 需求背景和解决方案

1. mousemove的时候，target可能是文本, 边缘会出现定位错误

2. 列拖动后，再选中某一行，列拖动后到距离被重置了

📝 更新日志

• fix(table): 列拖动优化：target定位错误；选中行后列拖动距离被重置问题

• 本条 PR 不需要纳入 Changelog

☑️ 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 #870 (5f264cb) into develop (a0db0df) will increase coverage by 3.82%.
The diff coverage is 68.75%.

@@             Coverage Diff             @@
##           develop     #870      +/-   ##
===========================================
+ Coverage    57.56%   61.38%   +3.82%     
===========================================
  Files          346      355       +9     
  Lines        12828    13470     +642     
  Branches      2405     2556     +151     
===========================================
+ Hits          7384     8269     +885     
+ Misses        5200     4942     -258     
- Partials       244      259      +15     

Impacted Files	Coverage Δ
src/avatar/group.tsx	97.14% <ø> (ø)
src/breadcrumb/breadcrumb-item-props.ts	100.00% <ø> (ø)
src/calendar/props.ts	70.00% <0.00%> (-30.00%)	⬇️
src/cascader/props.ts	91.66% <ø> (ø)
src/cascader/utils/inputContent.ts	59.45% <0.00%> (+6.68%)	⬆️
src/date-picker/date-picker.tsx	46.57% <0.00%> (+0.72%)	⬆️
src/date-picker/panel/date-range.tsx	7.48% <0.00%> (+0.29%)	⬆️
src/dialog/props.ts	70.00% <0.00%> (-30.00%)	⬇️
src/dropdown/dropdown-menu.tsx	18.42% <ø> (ø)
src/dropdown/dropdown.tsx	70.00% <0.00%> (+5.00%)	⬆️
... and 129 more

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