New: Added downloadId filter to v3 history api for third-party applications

closes #3105

src/Sonarr.Api.V3/History/HistoryModule.cs

@@ -66,6 +66,7 @@ namespace Sonarr.Api.V3.History
 
             var eventTypeFilter = pagingResource.Filters.FirstOrDefault(f => f.Key == "eventType");
             var episodeIdFilter = pagingResource.Filters.FirstOrDefault(f => f.Key == "episodeId");
+            var downloadIdFilter = pagingResource.Filters.FirstOrDefault(f => f.Key == "downloadId");
 
             if (eventTypeFilter != null)
             {
@@ -79,6 +80,12 @@ namespace Sonarr.Api.V3.History
                 pagingSpec.FilterExpressions.Add(h => h.EpisodeId == episodeId);
             }
             
+            if (downloadIdFilter != null)
+            {
+                var downloadId = downloadIdFilter.Value;
+                pagingSpec.FilterExpressions.Add(h => h.DownloadId == downloadId);
+            }
+
             return ApplyToPage(_historyService.Paged, pagingSpec, h => MapToResource(h, includeSeries, includeEpisode));
         }