Modify text in Apps & notifications settings.

- in Settings->Apps & notifications->Apps->[select app], update the
  header summary to installation status, and move the version text to
  the bottom of the page.
- updatd preference title from Apps to App info
- update preference title from Notifications to App notifications

Bug: 34977561
Test: make RunSettingsRoboTests
Change-Id: I97e9b81c739fb99eaca2cf45fb11f208ad6cd9ca