[Table] 支持获取获取全部树形结构数据

[chaishi]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交

🔗 相关 Issue

💡 需求背景和解决方案

📝 更新日志

• feat(Table): appendTo 支持添加新节点到根节点，tdesign-vue-next issue#849

• feat(Table): 新增 getTreeNode，用于获取整个树形结构，tdesign-vue-next issue#849

• feat(Table): EnhancedTable 支持事件 @drag-sort

• 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 #931 (659b6b5) into develop (a0db0df) will increase coverage by 2.53%.
The diff coverage is 61.72%.

@@             Coverage Diff             @@
##           develop     #931      +/-   ##
===========================================
+ Coverage    57.56%   60.09%   +2.53%     
===========================================
  Files          346      376      +30     
  Lines        12828    14338    +1510     
  Branches      2405     2669     +264     
===========================================
+ Hits          7384     8617    +1233     
- Misses        5200     5458     +258     
- Partials       244      263      +19     

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 166 more

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