fix(treeselect): 默认lazy异步加载开启

[carolin913]

🤔 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

• fix(treeselect): 默认lazy异步加载开启，与api保持一致

• 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 #1017 (fcb69f7) into develop (7b04365) will decrease coverage by 0.00%.
The diff coverage is 47.31%.

@@             Coverage Diff             @@
##           develop    #1017      +/-   ##
===========================================
- Coverage    60.40%   60.40%   -0.01%     
===========================================
  Files          937      943       +6     
  Lines        16498    16555      +57     
  Branches      3743     3758      +15     
===========================================
+ Hits          9966    10000      +34     
- Misses        6532     6555      +23     

Impacted Files	Coverage Δ
src/date-picker/DatePicker.tsx	16.21% <0.00%> (ø)
src/date-picker/DatePickerPanel.tsx	12.90% <0.00%> (ø)
src/date-picker/DateRangePicker.tsx	10.41% <0.00%> (ø)
src/date-picker/DateRangePickerPanel.tsx	10.37% <0.00%> (ø)
src/date-picker/base/Header.tsx	42.42% <ø> (ø)
src/date-picker/panel/PanelContent.tsx	70.58% <0.00%> (ø)
src/date-picker/panel/RangePanel.tsx	85.00% <ø> (ø)
src/date-picker/panel/SinglePanel.tsx	94.11% <ø> (ø)
src/form/_example/validator.jsx	33.33% <ø> (ø)
src/form/formModel.ts	62.79% <0.00%> (-1.50%)	⬇️
... and 15 more

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