Continued cleanup of WorkManager sample

fix CheeseViewModel insertSeparators comparison

Add a sample showing how to synchronously await for remote loads to be applied

* Add WorkManager multiprocess sample

* Add implementation for RemoteListenableWorker and RemoteCoroutineWorker

* Address comments

* Add README

* Add RemoteListenableWorker as example Java worker

updates navigation to 2.4.0-alpha01

Merge branch 'update-navigation-to-2.4.0alpha01' of https://github.com/android/architecture-components-samples into update-navigation-to-2.4.0alpha01

Merge branch 'update-navigation-to-2.4.0alpha01' of https://github.com/android/architecture-components-samples into update-navigation-to-2.4.0alpha01

Merge branch 'update-navigation-to-2.4.0alpha01' of https://github.com/android/architecture-components-samples into update-navigation-to-2.4.0alpha01

* Fix AndroidManifest warnings
* Improve formatting of App
* Request access to legacy storage #cleanup
* Move image insertion in separate function

* Update testing dependencies
* Add testing dependencies to WorkManager sample
* Add CleanupWorkerTest
* Add Test for BaseFilterWorker
* Test periodic execution

* Fix AndroidManifest warnings
* Improve formatting of App
* Request access to legacy storage #cleanup
* Move image insertion in separate function

* Update testing dependencies
* Add testing dependencies to WorkManager sample
* Add CleanupWorkerTest
* Add Test for BaseFilterWorker
* Test periodic execution

Explicitly override RemoteMediator.initialize with instructional comment

Fix + add transformation example to PagingSample tests

Renamed CheeseItem to CheeseListITem
Fix imports
Minor nits