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>

features/roomlist/impl/src/main/res/values/localazy.xml

@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
+  <string name="banner_migrate_to_native_sliding_sync_action">"Log Out &amp; Upgrade"</string>
+  <string name="banner_migrate_to_native_sliding_sync_description">"Your server now supports a new, faster protocol. Log out and log back in to upgrade now. Doing this now will help you avoid a forced logout when the old protocol is removed later."</string>
+  <string name="banner_migrate_to_native_sliding_sync_title">"Upgrade available"</string>
   <string name="banner_set_up_recovery_content">"Generate a new recovery key that can be used to restore your encrypted message history in case you lose access to your devices."</string>
   <string name="banner_set_up_recovery_title">"Set up recovery"</string>
   <string name="confirm_recovery_key_banner_message">"Your chat backup is currently out of sync. You need to enter your recovery key to maintain access to your chat backup."</string>