add plex network metadata (#2085)

* initial plumbing

* scan for plex networks

* save network contents to db as tags

* eliminate network tag id churn

* add network and show_network to search index

* update last networks scan

* show networks on tv show page

* update changelog

ErsatzTV.Scanner/Program.cs

@@ -202,6 +202,7 @@ public class Program
                     services.AddScoped<IPlexOtherVideoLibraryScanner, PlexOtherVideoLibraryScanner>();
                     services.AddScoped<IPlexTelevisionLibraryScanner, PlexTelevisionLibraryScanner>();
                     services.AddScoped<IPlexCollectionScanner, PlexCollectionScanner>();
+                    services.AddScoped<IPlexNetworkScanner, PlexNetworkScanner>();
                     services.AddScoped<IPlexServerApiClient, PlexServerApiClient>();
                     services.AddScoped<IPlexCollectionRepository, PlexCollectionRepository>();
                     services.AddScoped<IPlexMovieRepository, PlexMovieRepository>();