Library Update Queries and Mutations (#609)

* Add library update GraphQL endpoints

* No need for data classes

* UpdateLibraryManga

server/src/main/kotlin/suwayomi/tachidesk/graphql/subscriptions/UpdateSubscription.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+package suwayomi.tachidesk.graphql.subscriptions
+
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+import org.kodein.di.DI
+import org.kodein.di.conf.global
+import org.kodein.di.instance
+import suwayomi.tachidesk.graphql.types.UpdateStatus
+import suwayomi.tachidesk.manga.impl.update.IUpdater
+
+class UpdateSubscription {
+    private val updater by DI.global.instance<IUpdater>()
+
+    fun updateStatusChanged(): Flow<UpdateStatus> {
+        return updater.status.map { updateStatus ->
+            UpdateStatus(updateStatus)
+        }
+    }
+}