Add response size to http responses

(cherry picked from commit d899225509f04a9b6c72da19c7d63ff53498de22)

src/NzbDrone.Common/Http/HttpResponse.cs

@@ -81,7 +81,7 @@ namespace NzbDrone.Common.Http
 
         public override string ToString()
         {
-            var result = string.Format("Res: [{0}] {1}: {2}.{3}", Request.Method, Request.Url, (int)StatusCode, StatusCode);
+            var result = string.Format("Res: [{0}] {1}: {2}.{3} ({4} bytes)", Request.Method, Request.Url, (int)StatusCode, StatusCode, ResponseData?.Length ?? 0);
 
             if (HasHttpError && Headers.ContentType.IsNotNullOrWhiteSpace() && !Headers.ContentType.Equals("text/html", StringComparison.InvariantCultureIgnoreCase))
             {