* 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>
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