fix(table): 多级表头支持调整列宽

[ZTao-z]

🤔 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

#1332

💡 需求背景和解决方案

1. 多级表头模式下获取所有叶子列，重新计算叶子列的宽度

📝 更新日志

• fix(table): 多级表头支持调整列宽

• 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

[github-actions]

[codecov-commenter]

Codecov Report

Merging #1395 (94fa087) into develop (492d477) will increase coverage by 2.68%.
The diff coverage is 90.56%.

@@             Coverage Diff             @@
##           develop    #1395      +/-   ##
===========================================
+ Coverage    57.94%   60.63%   +2.68%     
===========================================
  Files          407      646     +239     
  Lines        15371    16137     +766     
  Branches      2931     2930       -1     
===========================================
+ Hits          8907     9784     +877     
+ Misses        6187     6059     -128     
- Partials       277      294      +17     

Impacted Files	Coverage Δ
src/alert/_example/icon.vue	100.00% <ø> (ø)
src/alert/_usage/index.vue	0.00% <ø> (ø)
src/anchor/_usage/index.vue	0.00% <ø> (ø)
src/avatar/_example/base.vue	100.00% <ø> (ø)
src/avatar/_usage/index.vue	0.00% <ø> (ø)
src/badge/_usage/index.vue	0.00% <ø> (ø)
src/breadcrumb/_example/custom.vue	100.00% <ø> (ø)
src/breadcrumb/_example/dropdown.vue	100.00% <ø> (ø)
src/button/_example/icon.vue	100.00% <ø> (ø)
src/button/_usage/index.vue	0.00% <ø> (ø)
... and 449 more

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