Introduce NavigationBar widget with Material 3 support

[rami-a]

Use case

Allow developers that are using Material You/v3 to have a correctly styled NavigationBar

Proposal

Introduce a new widget called NavigationBar that can be used as a replacement for BottomNavigationBar. The previous component has some outdated tech debt and features from earlier versions of the Material spec.

[bernaferrari]

Can you use NavigationBar at the top? Because there were some things in the initial implementation that prevented this.

[rami-a]

Conceptually, it is meant to be used at the bottom.

Technically, I don't think there would be any reason why you couldn't use it at the top (though the preferred use is to provide it to the bottomNavigationBar field of scaffold.

[bernaferrari]

If I remember well, the tooltip only works/worked on bottom (otherwise it wouldn't be shown).

[rami-a]

If I remember well, the tooltip only works/worked on bottom (otherwise it wouldn't be shown).

Ah, then I believe that issue persists in this new version (for now) but I think adding a way to theme (allow customizing the position/style/etc) the tooltip would be straightforward and non-breaking to land in a follow-up PR

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