feat(breadcrumb): support routes and more props config

[hehehai]

Types of changes

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

Background and context

Solution

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
breadcrumb	支持 separator 属性	suport separator prop	-
breadcrumb	支持 routes 属性	suport routes prop	-
breadcrumb	支持 more-icon 插槽	suport more-icon slot	-
breadcrumb-item	支持 droplist 属性和插槽	suport droplist prop and slot	-

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

• [x] 下拉菜单
• [x] routes 配置
• [ ] droplist props (需要帮助 😅 类型要单独声明一份还是要？)
• [ ] feat version

🤔 RFC（暂时不实现）

• [ ] 有关 ellipsis 的设置，配置 tooltip 展示
• [ ] 有关 <a href={#/${paths.join('/').replace(/^//, '')}}> 路径合并方法，是否要设置为 prop 配置函数（支持自定义），可选属性