feat: new component tour

[cszhjh]

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• Fix linting errors
• Tests have been added / updated (or snapshots)

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Issues

close #1797

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commit: a4d9c5a

[haoziqaq]

总体感觉非常好，几个修改意见：

1. var-tour-step 的样式风格和 api 设计感觉应该与 dialog 组件有一定的映射关系，毕竟都是 “对话框”。
2. 内置的关闭按钮，最好换一种风格。
   
3. indicators 最好是能做到点击时切换步骤
4. 增加 esc 的键盘触发关闭
5. primary 的 indicator 未选中的状态颜色不太明显，可能需要优化一下
   

[haoziqaq]

TourSteps 这个组件可以考虑一下使用 useChildren useParent 之后，是否还是必要的。