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

Commencez par localiser le composant BottomNavigation et suivre la manière dont l’état de navigation détermine l’élément sélectionné. Vérifiez le comportement attendu pour les indices négatifs ou hors limites et ajoutez une couverture de tests aux côtés des tests existants du composant. Le travail est terminé lorsqu’une route en dehors des éléments de BottomNavigation laisse tous les éléments non sélectionnés sans modifier le comportement normal de sélection.

Rédigé par le modèle d'indexation à partir du texte de l'issue.