Inconsistency between matTabNavBar and matTabGroup

[VagrantAI-c]

Bug, feature request, or proposal:

Proposal (or bug?)

What is the expected behavior?

matTabNavBar and matTabGroup should both have mat-align-tabs input

What is the current behavior?

Only matTabGroup supports mat-align-tabs

What are the steps to reproduce?

https://stackblitz.com/edit/angular-3keysh?file=app/tab-group-align-example.html

What is the use-case or motivation for changing an existing behavior?

Backward compatibility between these two is a nice to have option if there is a sudden need of switching from one to another

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular Material 7.0.1

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