perf(runtime): 降低使用 react 的内存占用 #6099
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0369c98
会在元素被从 DOM 树中清除时，同时清理它的所有子元素，以及他们的引用
97efc45
重构 react 的事件代理机制，从前使用 weakMap 实现，但由于小程序开发者工具没有可以找到对象引用关系的工具，无法定位问题。目前的实现把事件代理机制绑定到 DOM 本身，利用
TaroEventTarget的内部对象实现。