New: Release Type (Single/Multi episode and Season Pack) for Custom Formats

Closes #3562

src/NzbDrone.Core/Blocklisting/BlocklistService.cs

@@ -194,6 +194,11 @@ namespace NzbDrone.Core.Blocklisting
                 blocklist.IndexerFlags = flags;
             }
 
+            if (Enum.TryParse(message.Data.GetValueOrDefault("releaseType"), true, out ReleaseType releaseType))
+            {
+                blocklist.ReleaseType = releaseType;
+            }
+
             _blocklistRepository.Insert(blocklist);
         }