dropdown添加minOverlayWidthMatchTrigger属性

[wapznw]

这个变动的性质是

• 新特性提交
• 日常 bug 修复
• 站点、文档改进
• 组件样式改进
• TypeScript 定义更新
• 重构
• 代码风格优化
• 分支合并
• 其他改动（是关于什么的改动？）

需求背景

在某个列表上使用dropdown作为右键菜单弹出的菜单宽度与列表一样宽。
查看了vc-dropdown中有minOverlayWidthMatchTrigger属性可以控制。
ant-design-vue中现在无法设置这个属性，添加了这个属性。

<a-dropdown :minOverlayWidthMatchTrigger="false" :trigger="['contextmenu']">
....
</a-dropdown>

[netlify]

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[codecov]

Codecov Report

Merging #954 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #954   +/-   ##
=======================================
  Coverage   87.25%   87.25%           
=======================================
  Files         145      145           
  Lines        4832     4832           
  Branches     1423     1423           
=======================================
  Hits         4216     4216           
  Misses        572      572           
  Partials       44       44

Impacted Files	Coverage Δ
components/dropdown/getDropdownProps.js	100% <ø> (ø)	⬆️

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[github-actions]

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