Add support for showing marked for deletion

kafkat would be great if it could detect if a topic is marked for deletion. 

kafka output

```
$ /bin/kafka-topics.sh --list --zookeeper zoo.example.com/kafka
foo - marked for deletion
bar
```

kafkat output

```
$ kafkat topics
foo
bar
```

This is on kafka 8.2 which has improved support for deleting topics
