initialize
abstract fun initialize(adapterContext: PanelContainerControllerAdapterContext<V>, restorePanelContainerViewModel: PanelContainerViewModel<CD, VM, SD>?)
Initializes the adapter. This must be called before update or onStop is called.
When the system UI is recreated, restorePanelContainerViewModel should be passed, indicating which panel sub-containers to restore for the panels previously presented.