Convert NavigationView to Fragment (1/2)

- Replace NavigationView with DrawerFragment
- Load groups and filters in DrawerFragment, rather than in
  PeopleActivity directly
- based on RecylcerView, which seems more future-proof
- LTR layout and A11Y is handled
- new badge is implemented
- menu selection is implemented

Bug: 34062530

Test: quick sanity check

Change-Id: I630978e64dc4fd386e25cedfd04f53ea2bd8679f