enhance(menu): menu color transition of selected items

[oljc]

Types of changes

• New feature
• Bug fix
• Enhancement
• Component style change
• Typescript definition change
• Documentation change
• Coding style change
• Refactoring
• Test cases
• Continuous integration
• Breaking change
• Others

Background and context

Solution

参考 React：arco-design/arco-design#263

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
Menu	修复已选中菜单项中的颜色动画过渡效果	fix color transition effect in selected menu item	Close #2394

Checklist:

• Test suite passes (npm run test)
• Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others
  should be submitted to main branch)

Other information

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