Add banner for optional migration to simplified sliding sync (#3429)

* Add banner for optional migration to native sliding sync

- Add `MatrixClient.isNativeSlidingSyncSupported()` and `MatrixClient.isUsingNativeSlidingSync` to check whether the home server supports native sliding sync and we're already using it.
- Add `NativeSlidingSyncMigrationBanner` composable to the `RoomList` screen when the home server supports native sliding sync but the current session is not using it.
- Add an extra logout successful action to the logout flow, create `EnableNativeSlidingSyncUseCase` so it can be used there.

* Update screenshots

* Make sure the sliding sync migration banner has lower priority than the encryption setup ones

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/RustMatrixClient.kt

@@ -93,6 +93,7 @@ import org.matrix.rustcomponents.sdk.IgnoredUsersListener
 import org.matrix.rustcomponents.sdk.NotificationProcessSetup
 import org.matrix.rustcomponents.sdk.PowerLevels
 import org.matrix.rustcomponents.sdk.SendQueueRoomErrorListener
+import org.matrix.rustcomponents.sdk.SlidingSyncVersion
 import org.matrix.rustcomponents.sdk.TaskHandle
 import org.matrix.rustcomponents.sdk.use
 import timber.log.Timber
@@ -528,6 +529,14 @@ class RustMatrixClient(
         })
     }.buffer(Channel.UNLIMITED)
 
+    override suspend fun isNativeSlidingSyncSupported(): Boolean {
+        return client.availableSlidingSyncVersions().contains(SlidingSyncVersion.Native)
+    }
+
+    override fun isUsingNativeSlidingSync(): Boolean {
+        return client.session().slidingSyncVersion == SlidingSyncVersion.Native
+    }
+
     internal fun setDelegate(delegate: RustClientSessionDelegate) {
         client.setDelegate(delegate)
     }