feat(dropdown):使用compositionAPI重构dropdown组件

[qunbotop]

🤔 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

#58 dropdown组件重构

💡 需求背景和解决方案

📝 更新日志

• feat(dropdown): 使用compositionAPI重构dropdown组件

• 本条 PR 不需要纳入 Changelog

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⚠️ 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
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[github-actions]

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (develop@b4170b9). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop     #749   +/-   ##
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  Coverage           ?   61.48%           
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  Files              ?      404           
  Lines              ?    14128           
  Branches           ?     2685           
==========================================
  Hits               ?     8687           
  Misses             ?     5189           
  Partials           ?      252           

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[PengYYYYY]

点击后向上了

[qunbotop]

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已修复