Replace --include-threads and --include-archived-threads with a single multi-value option

Related to #1119

DiscordChatExporter.Cli/Commands/GetDirectChannelsCommand.cs

@@ -44,7 +44,9 @@ public class GetDirectChannelsCommand : DiscordCommandBase
 
             // Channel category / name
             using (console.WithForegroundColor(ConsoleColor.White))
-                await console.Output.WriteLineAsync($"{channel.ParentNameWithFallback} / {channel.Name}");
+                await console.Output.WriteLineAsync(
+                    $"{channel.ParentNameWithFallback} / {channel.Name}"
+                );
         }
     }
 }