feat(popover): 新增属性 action,简化css 变量

[xiaoyatong]

🤔 这个变动的性质是？

• 新特性提交
• 日常 bug 修复
• 站点、文档改进
• 演示代码改进
• 组件样式/交互改进
• TypeScript 定义更新
• 包体积优化
• 性能优化
• 功能增强
• 国际化改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他改动（是关于什么的改动？）

🔗 相关 Issue

💡 需求背景和解决方案

☑️ 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
• fork仓库代码是否为最新避免文件冲突
• Files changed 没有 package.json lock 等无关文件

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (1bf50ee) 74.06% compared to head (9c7527b) 74.03%.
Report is 3 commits behind head on next.

❗ Current head 9c7527b differs from pull request most recent head 6580c93. Consider uploading reports for the commit 6580c93 to get more accurate results

Files	Patch %	Lines
src/packages/popover/popover.tsx	42.85%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #1747      +/-   ##
==========================================
- Coverage   74.06%   74.03%   -0.03%     
==========================================
  Files         211      211              
  Lines        8575     8581       +6     
  Branches     2432     2437       +5     
==========================================
+ Hits         6351     6353       +2     
- Misses       2016     2019       +3     
- Partials      208      209       +1     

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