Allow BottomNavigation to have items unselected

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There is the use case where it would make sense that if you are using the BottomNavigation component together with a top navigation component that will open a drawer with multiple menu items, when one of the items selected from the drawer is not also part of the BottomNavigation menu items to have no menu item selected in the bottom navigation component.

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We could check the index of the navigation state, if it is either negative or greater than the routes length, we do not set focus . Then developers can pass either if the user navigates to a different menu that is not part of the bottom navigation.

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Material UI seem to support inactive states as per https://m2.material.io/components/bottom-navigation#states

首先定位 BottomNavigation 组件，并跟踪导航状态如何确定选中的项目。验证负索引或超出范围的索引的预期行为，并在该组件现有测试旁补充覆盖测试。完成的标准是：位于底部导航项目之外的路由会使所有项目均处于未选中状态，同时不改变正常的选择行为。

由索引模型根据 Issue 内容生成。