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/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/RustMatrixClient.kt

@@ -800,6 +800,12 @@ class RustMatrixClient(
         }
     }
 
+    override suspend fun markAllRoomsAsRead(): Result<Unit> = withContext(sessionDispatcher) {
+        runCatchingExceptions {
+            innerClient.markAllRoomsAsRead()
+        }
+    }
+
     override suspend fun performDatabaseVacuum(): Result<Unit> = withContext(sessionDispatcher) {
         runCatchingExceptions {
             Timber.d("Performing database vacuuming for session $sessionId...")