feat(GraphModel, MiniMap): 新增MiniMap组件跟随的当前容器一起缩放 #1961
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使用ResizeObserver监听GraphModel中的rootEl大小变化，并新增抛出“graph:resize”事件，MiniMap监听“graph:resize”实现跟随缩放 Closes didi#1957
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新增功能：现在EventEmitter的on和once返回一个新的函数，直接执行时，会清除这次注册的事件，同时在此函数上挂载了新的on和once方法，用法和EventEmitter一致
…NodeSelection 节点时，自动缩放其关联的子节点
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这个 PR 似乎带了些额外的提交，这边会优先看 MiniMap 优化相关的部分，事件系统这块可能争议比较大，需要讨论一下。 辛苦把 MiniMap 插件优化与事件系统优化这两个提交分开提 PR 🙏。 |
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使用ResizeObserver监听GraphModel中的rootEl大小变化，并新增抛出“graph:resize”事件，MiniMap监听“graph:resize”实现跟随缩放
Closes #1957