[RON] Scaffolding for EnRouteStyle content extraction and view inflation.

For collapsed (contracted) view, wrapped
@*android:layout/notification_template_material_base inside EnRouteView
in the SystemUI layout.

For scaffolding, just filled out the minimal three fields for the
collapsed view. The rest will be filled when the structure is ok.

Flag: android.app.api_rich_ongoing
Flag: com.android.systemui.notification_row_content_binder_refactor
Bug: 359128724
Bug: 359920094
Test: EnRouteViewModelTest
Test: Trigger example EnRouteStyle notification on device
Change-Id: I6f1f5e9524768f285597e772d6ceaf885bd640d6