Sync notifications using WorkManager (#5545)

* Initial implementation of notification sync using `WorkManager`

* Use custom `MetroWorkerFactory` to allow assisted injection in WorkManager Workers

* Add tests for `FetchNotificationWorker`. Create `FakeNotificationResolverQueue` to help testing.

* Add more tests, fix Konsist checks

* Add tests for `SyncNotificationWorkManagerRequest`

* Simplify `FakeNotificationResolverQueue`

tests/konsist/src/test/kotlin/io/element/android/tests/konsist/KonsistClassNameTest.kt

@@ -100,6 +100,7 @@ class KonsistClassNameTest {
             .withoutName(
                 "FakeFileSystem",
                 "FakeImageLoader",
+                "FakeListenableFuture",
             )
             .assertTrue {
                 val interfaceName = it.name
@@ -149,6 +150,7 @@ class KonsistClassNameTest {
                 "Factory",
                 "TimelineController",
                 "TimelineMediaGalleryDataSource",
+                "MetroWorkerFactory",
             )
             .withoutNameStartingWith(
                 "Accompanist",