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/preferences/api/src/main/kotlin/io/element/android/libraries/preferences/api/store/EnableNativeSlidingSyncUseCase.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Please see LICENSE in the repository root for full details.
+ */
+
+package io.element.android.libraries.preferences.api.store
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+import javax.inject.Inject
+
+class EnableNativeSlidingSyncUseCase @Inject constructor(
+    private val appPreferencesStore: AppPreferencesStore,
+    private val appCoroutineScope: CoroutineScope,
+) {
+    operator fun invoke() {
+        appCoroutineScope.launch {
+            appPreferencesStore.setSimplifiedSlidingSyncEnabled(true)
+        }
+    }
+}

libraries/preferences/api/src/test/kotlin/io/element/android/libraries/preferences/api/store/EnableNativeSlidingSyncUseCaseTest.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Please see LICENSE in the repository root for full details.
+ */
+
+package io.element.android.libraries.preferences.api.store
+
+import com.google.common.truth.Truth.assertThat
+import io.element.android.libraries.preferences.test.InMemoryAppPreferencesStore
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.test.advanceUntilIdle
+import kotlinx.coroutines.test.runTest
+import org.junit.Test
+
+class EnableNativeSlidingSyncUseCaseTest {
+    @OptIn(ExperimentalCoroutinesApi::class)
+    @Test
+    fun `ensure that the use case sets the simplified sliding sync enabled flag`() = runTest {
+        val preferencesStore = InMemoryAppPreferencesStore()
+        val useCase = EnableNativeSlidingSyncUseCase(preferencesStore, this)
+        assertThat(preferencesStore.isSimplifiedSlidingSyncEnabledFlow().first()).isFalse()
+
+        useCase()
+        advanceUntilIdle()
+
+        assertThat(preferencesStore.isSimplifiedSlidingSyncEnabledFlow().first()).isTrue()
+    }
+}