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>

features/logout/impl/src/main/kotlin/io/element/android/features/logout/impl/DefaultLogoutEntryPoint.kt

@@ -27,6 +27,15 @@ class DefaultLogoutEntryPoint @Inject constructor() : LogoutEntryPoint {
                 return this
             }
 
+            override fun onSuccessfulLogoutPendingAction(action: () -> Unit): LogoutEntryPoint.NodeBuilder {
+                plugins += object : LogoutNode.SuccessfulLogoutPendingAction, Plugin {
+                    override fun onSuccessfulLogoutPendingAction() {
+                        action()
+                    }
+                }
+                return this
+            }
+
             override fun build(): Node {
                 return parentNode.createNode<LogoutNode>(buildContext, plugins)
             }

features/logout/impl/src/main/kotlin/io/element/android/features/logout/impl/LogoutNode.kt

@@ -33,6 +33,12 @@ class LogoutNode @AssistedInject constructor(
         plugins<LogoutEntryPoint.Callback>().forEach { it.onChangeRecoveryKeyClick() }
     }
 
+    interface SuccessfulLogoutPendingAction : Plugin {
+        fun onSuccessfulLogoutPendingAction()
+    }
+
+    private val customOnSuccessfulLogoutPendingAction = plugins<SuccessfulLogoutPendingAction>().firstOrNull()
+
     @Composable
     override fun View(modifier: Modifier) {
         val state = presenter.present()
@@ -41,7 +47,10 @@ class LogoutNode @AssistedInject constructor(
         LogoutView(
             state = state,
             onChangeRecoveryKeyClick = ::onChangeRecoveryKeyClick,
-            onSuccessLogout = { onSuccessLogout(activity, isDark, it) },
+            onSuccessLogout = {
+                customOnSuccessfulLogoutPendingAction?.onSuccessfulLogoutPendingAction()
+                onSuccessLogout(activity, isDark, it)
+            },
             onBackClick = ::navigateUp,
             modifier = modifier,
         )