如何解决NavDestination切换页面后浏览位置无法保存问题

问题现象
在HarmonyOS中，使用NavDestination实现页面跳转至其他页面后，下次进入如何保持跳转前页面的浏览位置？

背景知识
Navigation：Navigation组件是路由导航的根视图容器，一般作为Page页面的根容器使用，其内部默认包含了标题栏、内容区和工具栏，其中内容区默认首页显示导航内容（NavDestination的子组件）或非首页显示（NavDestination的子组件），首页和非首页通过路由进行切换。
@ohos.arkui.observer(无感监听)提供UI组件行为变化的无感监听能力。可以监听Navigation的页面切换事件进行相应操作。
Scroll是一种可滚动的容器组件，当子组件的布局尺寸超过父组件的尺寸时，内容可以滚动。
onDidScroll方法在Scroll滚动时触发，可用于在滑动过程中获取Scroll组件的偏移量yOffset。
scrollTo方法可用于让Scroll组件滑动到指定位置。
AppStorage是应用全局的UI状态存储，和应用的进程绑定，只能在UI主线程中使用，无法在子线程中使用、修改。
解决方案
方案一：使用路由模式保留页面实例。
在页面跳转时不要使用pop和clear等方法，否则NavDestination页面会被回收。可以采用单例模式MOVE_TO_TOP_SINGLETON跳转至指定的页面，该方式会使用栈内已存在的页面实例（即浏览位置不变）。

由于单例模式是从栈底到栈顶依次查找，当栈内存在多个同名页面实例时，会默认跳转最底层的同名页面实例，所以需确保栈内只存在一个同名实例，否则跳转的页面保留的滚动位置与上一次显示的页面会不一致（显示的是栈底同名实例保留的滚动位置）。
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