Move migration screen to within the room list (#2361)

* Rename migration bg drawable and add night variant
* Move `migration` package from `ftue` to `messages:impl` module
* Update `SunsetPage` with light and dark modes
* Fix bloom colors when nested theme is used
* Integrate the migration screen in the room list
* Fix `WaitListView` cancel button color
* Clear migration store when removing the app's cache

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

features/roomlist/api/src/main/kotlin/io/element/android/features/roomlist/api/migration/MigrationScreenStore.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.features.roomlist.api.migration
+
+import io.element.android.libraries.matrix.api.core.SessionId
+
+interface MigrationScreenStore {
+    fun isMigrationScreenNeeded(sessionId: SessionId): Boolean
+    fun setMigrationScreenShown(sessionId: SessionId)
+    fun reset()
+}