[Partial Screensharing] Implement loading of recent tasks, thumbnails and icons

Adds implementation of providers to get list of
recent tasks, recent task thumbnails and icons.

Adds a method to Shell's RecentTasks interface to
get a provider of recent tasks without using the IRecentTasks
binder object (which is used by Launcher) as we can
call it directly inside SystemUI.

Bug: 240924731
Test: atest com.android.wm.shell.recents.RecentTasksControllerTest
Test: atest com.android.systemui.mediaprojection.appselector.data.ShellRecentTaskListProviderTest
Change-Id: I89579fc8e4e07f6bf656d300ecdbb75bdcb91035