Add warnings when library and download queues are considered large (closes #5950)

Arbitrarily set at a size of 100 for now. We could adjust this in the future as appropriate if needed.

app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateNotifier.kt

@@ -88,6 +88,20 @@ class LibraryUpdateNotifier(private val context: Context) {
         )
     }
 
+    fun showQueueSizeWarningNotification() {
+        val notification = context.notificationBuilder(Notifications.CHANNEL_LIBRARY_PROGRESS) {
+            setContentTitle(context.getString(R.string.label_warning))
+            setSmallIcon(R.drawable.ic_warning_white_24dp)
+            setStyle(NotificationCompat.BigTextStyle().bigText(context.getString(R.string.notification_size_warning)))
+        }
+            .build()
+
+        context.notificationManager.notify(
+            Notifications.ID_LIBRARY_SIZE_WARNING,
+            notification,
+        )
+    }
+
     /**
      * Shows notification containing update entries that failed with action to open full log.
      *

app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt

@@ -264,6 +264,10 @@ class LibraryUpdateService(
         mangaToUpdate = listToUpdate
             .distinctBy { it.id }
             .sortedWith(rankingScheme[selectedScheme])
+
+        if (mangaToUpdate.size > QUEUE_SIZE_WARNING_THRESHOLD) {
+            notifier.showQueueSizeWarningNotification()
+        }
     }
 
     /**
@@ -567,3 +571,5 @@ class LibraryUpdateService(
         return File("")
     }
 }
+
+const val QUEUE_SIZE_WARNING_THRESHOLD = 100