Implements Material Design Web Component: TopAppBar
The top app bar provides content and actions related to the current screen. It’s used for branding, screen titles, navigation, and actions.
There are two types of top app bar: 1. Regular top app bar 2. Contextual action bar
See: https://material-components.github.io/material-components-web-catalog/#/component/top-app-bar
TopAppBar component.
Get formatted literal string for different types of TopAppBar.
Overridden because the templates are the same.
TopAppBar left section
TopAppBar navigation button
TopAppBar title
TopAppBar left section