fix(tree-select): 支持treeProps.keys.children字段配置

[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 #888

💡 需求背景和解决方案

配置treeProps.keys的children为自定义值。选中子节点， 选中展示的是value值， 应该展示label。
经排查是tree-select未支持自定义的treeProps.keys.children配置

📝 更新日志

• fix(tree-select): 支持treeProps.keys.children字段配置

• 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 #890 (5cbe303) into develop (a0db0df) will increase coverage by 3.12%.
The diff coverage is 67.81%.

@@             Coverage Diff             @@
##           develop     #890      +/-   ##
===========================================
+ Coverage    57.56%   60.68%   +3.12%     
===========================================
  Files          346      355       +9     
  Lines        12828    13602     +774     
  Branches      2405     2592     +187     
===========================================
+ Hits          7384     8254     +870     
+ Misses        5200     5089     -111     
- 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 137 more

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