Create category list screen (EXPOSUREAPP-5719) #2604

* Add strings for Category Screen

* Create TraceLocationCategory lists for event and location

* Create base implementation of EventRegistrationTestFragment.kt

* Move some classes to sub package

* Finalize layout

* Some layout and accessibility adaptations

* Fix ktlint issues

* Refactor TraceLocationCategoryFragment.kt

* Fix typo

* Use MaterialToolbar

* Add tools:layout for category fragment in test_nav_graph.xml

* Refactor to RecyclerView with ModularAdapter

* Adapt naming of fragment and layouts

* Create TraceLocationCategoryViewModel.kt

* Move CategoryItemList to ViewModel

* Create TraceLocationCategoryViewModelTest.kt

* Fix Lint issues

* Refactor some DI logic

* Move UI components to correct package

* Reformat separator layout

Co-authored-by: Juraj Kusnier <jurajkusnier@users.noreply.github.com>
Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>