Complication Entity & Presentation Refactor.

This changelist revises how complications are handled in SystemUI. A ViewModel layer replaces the existing ComplicationProvider infrastructure. This abstraction helps separate the presentation from the complication component lifecycle. These ViewModels are provided through a LiveData wrapper around the state in DreamOverlayStateController. The presentation layer is also abstracted with a layout being controlled by ComplicationLayoutEngine.

Bug: 214575036
Test: atest ComplicationCollectionLiveDataTest ComplicationHostViewControllerTest ComplicationLayoutEngineTest ComplicationLayoutParamsTest ComplicationViewModelTransformerTest
Change-Id: I6f0ca256a9ccf31a035cf3fed2287903917905b7