feat: nested json (#2415)

* feat: nested json

* feat: remove up_to_date from json output when --no-status flag is set

* feat: restrict use of --nested with --json and --list/--list-all

cmd/task/task.go

@@ -128,6 +128,7 @@ func run() error {
 		flags.ListAll,
 		flags.ListJson,
 		flags.NoStatus,
+		flags.Nested,
 	)
 	if listOptions.ShouldListTasks() {
 		if flags.Silent {