Add read all messages feature (#7049)

* Add read all messages feature: read all messages using Client.markAllRoomsAsRead() method

* Move the 'mark all rooms as read' footer as part of the list item

* Replace `showMarkAllRoomsAsReadConfirmation` and its associated event with `MarkAllRoomsAsRead(val needsConfirmation: Boolean)` and a `AsyncAction.Confirming` state

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Co-authored-by: Jorge Martín <jorgem@element.io>

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/MatrixClient.kt

@@ -203,6 +203,12 @@ interface MatrixClient {
      */
     suspend fun markRoomAsFullyRead(roomId: RoomId, eventId: EventId): Result<Unit>
 
+    /**
+     * Mark all joined rooms as read by sending public, private and fully-read receipts
+     * on each room's latest event. Per-room errors are logged and skipped by the SDK.
+     */
+    suspend fun markAllRoomsAsRead(): Result<Unit>
+
     /**
      * Check if linking a new device using QrCode is supported by the server.
      */