fix: 解决 treeNodeModel 实例未能同步 node 属性的问题 #1535
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🤔 这个 PR 的性质是？
🔗 相关 Issue
解决 treeNodeModel 实例未能同步 node 属性的问题。
进行了小幅度的性能改进。
💡 需求背景和解决方案
问题: treeNodeModel 实例未能同步 node 属性，取得 treeNodeModel 之后，如果更改了 treeNode 的状态，读取原 treeNodeModel 实例的 visible, checked 等属性时，拿到的还是之前取值时的状态。
解决方式: 这类属性改为使用 public get 方式定义，变为取值方式，可确保之后即使用户自行缓存了 treeNodeModel 节点，也能拿到同步的属性。
📝 更新日志
fix(tree): 解决 treeNodeModel 实例未能同步 node 属性的问题
refactor(tree): 用 nextTick 机制替换了 timeout 延时，来检查 tree 结构，并触发更新事件。
perf(tree): 设置 store 选项时，仅更新节点状态，不更新节点选中态，减少计算量。
本条 PR 不需要纳入 Changelog
☑️ 请求合并前的自查清单