Throw a toastr on matched metadata page when there is a rate limit issue.

API/SignalR/MessageFactory.cs

@@ -152,6 +152,10 @@ public static class MessageFactory
     /// A Person merged has been merged into another
     /// </summary>
     public const string PersonMerged = "PersonMerged";
+    /// <summary>
+    /// A Rate limit error was hit when matching a series with Kavita+
+    /// </summary>
+    public const string ExternalMatchRateLimitError = "ExternalMatchRateLimitError";
 
     public static SignalRMessage DashboardUpdateEvent(int userId)
     {
@@ -679,4 +683,16 @@ public static class MessageFactory
             },
         };
     }
+    public static SignalRMessage ExternalMatchRateLimitErrorEvent(int seriesId, string seriesName)
+    {
+        return new SignalRMessage()
+        {
+            Name = ExternalMatchRateLimitError,
+            Body = new
+            {
+                seriesId = seriesId,
+                seriesName = seriesName,
+            },
+        };
+    }
 }