fix(comp-tree): support comp-tree-foreach stop,add insertNodesByKey #818
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Subject of the feature
优化tree组件遍历函数支持批量插入子节点
Problem
当树节点非常大的时候，插入节点的函数出现性能不佳浏览器卡顿
api仅提供了插入单个子节点，插入多个节点重复调用性能较差
Expected behaviour
在treeHelper forEach中根据节点处理返回true及时终止无意义遍历
提供批量插入 insertNodesByKey