The SingleMenuEntry constructor has too many optional parameters
which makes it confusing and dificult to use.
Instead system should provide a named constructor `create` that
creates new menu entry instance with Icon and click tracking enabled.
If developer wants to override event tracking/change icon it is
possible via calling `trackClicks` and `setIcon` method calls.
This is a first refactoring step to simplify the SingleMenuEntry,
the next follow-up will remove unnecessary PageActionsDirector.
Bug: T232734
Change-Id: I7a631a635a5c5932845639123c285d1d18df1b5d
- Separate AuthMenuEntry into reusable parts.
- Add some missed finals in nearby classes.
Bug: T214540
Change-Id: Icf285bf8d2b791dd1aa4ee37ae90d27afe42bd91
