Add some category methods

- Extract CursorUtils for Category and Item
- Add related methods of getCategories and getCategoryItems in
  PickerViewModdel
- Fix getItem with categogry issue
- Support localizations for default categories.

Test: atest CategoryTest
Bug: 185801192
Change-Id: I5eb39f94e28c779d20176063e12e300a4e5957a1
Merged-In: I5eb39f94e28c779d20176063e12e300a4e5957a1
(cherry picked from commit b6cf17bb072a6983bbdc0816d97489b7765420ad)
8 files changed