Force last owner of a room to pass ownership when leaving (#5094)

* Move `ChangeRoles*` classes to their own module so they can be shared

* Hook the change roles screen to the leave room action, add confirmation dialogs

* Use enum instead of sealed interface for `ChangeRoomMemberRolesListType`

* Try to improve communications between nodes

* refactor (leave room) : makes sure to expose only necessary code from api module

* Add `:libraries:previewutils` module to share some test fixtures used for UI previews

* Update screenshots

---------

Co-authored-by: ElementBot <android@element.io>
Co-authored-by: ganfra <francoisg@matrix.org>

libraries/previewutils/build.gradle.kts

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2022-2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+plugins {
+    id("io.element.android-library")
+}
+
+android {
+    namespace = "io.element.android.libraries.previewutils"
+
+    dependencies {
+        implementation(projects.libraries.designsystem)
+        implementation(projects.libraries.matrix.api)
+
+        implementation(libs.kotlinx.collections.immutable)
+    }
+}

libraries/previewutils/src/main/kotlin/io/element/android/libraries/previewutils/room/RoomMemberFixture.kt

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2023, 2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.previewutils.room
+
+import io.element.android.libraries.matrix.api.core.UserId
+import io.element.android.libraries.matrix.api.room.RoomMember
+import io.element.android.libraries.matrix.api.room.RoomMembershipState
+import kotlinx.collections.immutable.persistentListOf
+
+fun aRoomMember(
+    userId: UserId = UserId("@alice:server.org"),
+    displayName: String? = null,
+    avatarUrl: String? = null,
+    membership: RoomMembershipState = RoomMembershipState.JOIN,
+    isNameAmbiguous: Boolean = false,
+    powerLevel: Long = 0L,
+    normalizedPowerLevel: Long = 0L,
+    isIgnored: Boolean = false,
+    role: RoomMember.Role = RoomMember.Role.User,
+    membershipChangeReason: String? = null,
+) = RoomMember(
+    userId = userId,
+    displayName = displayName,
+    avatarUrl = avatarUrl,
+    membership = membership,
+    isNameAmbiguous = isNameAmbiguous,
+    powerLevel = powerLevel,
+    normalizedPowerLevel = normalizedPowerLevel,
+    isIgnored = isIgnored,
+    role = role,
+    membershipChangeReason = membershipChangeReason,
+)
+
+fun aRoomMemberList() = persistentListOf(
+    anAlice(),
+    aBob(),
+    aRoomMember(UserId("@carol:server.org"), "Carol"),
+    aRoomMember(UserId("@david:server.org"), "David"),
+    aRoomMember(UserId("@eve:server.org"), "Eve"),
+    aRoomMember(UserId("@justin:server.org"), "Justin"),
+    aRoomMember(UserId("@mallory:server.org"), "Mallory"),
+    aRoomMember(UserId("@susie:server.org"), "Susie"),
+    aVictor(),
+    aWalter(),
+)
+
+fun anAlice() = aRoomMember(UserId("@alice:server.org"), "Alice", role = RoomMember.Role.Admin)
+fun aBob() = aRoomMember(UserId("@bob:server.org"), "Bob", role = RoomMember.Role.Moderator)
+
+fun aVictor() = aRoomMember(
+    UserId("@victor:server.org"),
+    "Victor",
+    membership = RoomMembershipState.INVITE
+)
+
+fun aWalter() = aRoomMember(
+    UserId("@walter:server.org"),
+    "Walter",
+    membership = RoomMembershipState.INVITE
+)