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

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

libraries/preferences/api/build.gradle.kts

@@ -17,4 +17,8 @@ dependencies {
     implementation(libs.coroutines.core)
     implementation(projects.libraries.matrix.api)
     implementation(libs.androidx.datastore.preferences)
+
+    testImplementation(projects.libraries.preferences.test)
+    testImplementation(libs.test.truth)
+    testImplementation(libs.coroutines.test)
 }