Implement initial transient Taskbar EDU tooltips.

Since this tooltip looks and behaves differently than the existing EDU
sheet, it has its own view and controller implementations (I also may
have wanted to write some Kotlin).

To keep transient taskbar open while on the second EDU step, another
autohide suspend flag is defined. Additionally, special casing is added
to avoid hiding transient taskbar if autohiding is currently suspended.

Tooltips use the same assets as the bottom sheet for now, and are scaled
down to fit the tooltip dimensions.

Reset `Taskbar Education` in Developer Options to try EDU again.

[Demos]
- First: https://screenshot.googleplex.com/ASBeGvrb2EA5wEF.png
- Second: https://screenshot.googleplex.com/7fnfcTh9bMYezDc.png

Test: Manual
Test: Open app, see swipe-up tooltip.
Test: Swipe up to show transient taskbar, see features tooltip.
Bug: 263157739
Fix: 258460203
Change-Id: I473f5fccbae279db0614763b640da0a120b6b7f7