Introduce ActionBar in picker screens

This change focuses on phone screens. Tablet UI fix will be
done later.

- show SearchView on the action bar
- show "create new contact" as a menu on the split action bar
- keep "create new contact" button for tablet support.
- a few visual tweaks for phone

Also this removes "show all contacts" item in JoinContactActivity.
Now all contacts are shown by default.

Bug: 5394377
Change-Id: I82e59b374888d522c81cd4957cb3fde286b419f6