Allow user with enough power level to redact other's messages (#969)

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

@@ -105,6 +105,8 @@ interface MatrixRoom : Closeable {
 
     suspend fun canUserInvite(userId: UserId): Result<Boolean>
 
+    suspend fun canUserRedact(userId: UserId): Result<Boolean>
+
     suspend fun canUserSendState(userId: UserId, type: StateEventType): Result<Boolean>
 
     suspend fun canUserSendMessage(userId: UserId, type: MessageEventType): Result<Boolean>

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/powerlevels/MatrixRoomPowerLevels.kt

@@ -34,3 +34,9 @@ suspend fun MatrixRoom.canSendState(type: StateEventType): Result<Boolean> = can
  * Shortcut for calling [MatrixRoom.canUserSendMessage] with our own user.
  */
 suspend fun MatrixRoom.canSendMessage(type: MessageEventType): Result<Boolean> = canUserSendMessage(sessionId, type)
+
+/**
+ * Shortcut for calling [MatrixRoom.canUserRedact] with our own user.
+ */
+suspend fun MatrixRoom.canRedact(): Result<Boolean> = canUserRedact(sessionId)
+