Education view for collapsed stack; fix rtl text

- new view for stack education (similar to ManageEducationView)
- lazy init both stack and manage menu edu

fix rtl text
- set textAlignment to viewStart
- set TextView gravity to start in xml

Bug: 161939484

Test: force stack/manage edu to show, press both buttons, force rtl,
press both buttons again, change theme, change orientation, keep using
bubbles normally, no regressions

Test: don't force edu views to show; let them show once; reboot phone,
use bubbles normally (without edu views added to stack), no NPEs

Change-Id: Ia67001aef40f76d7161cc263f961375738f97939