There's no way of setting bbcode/smiley/magic url options on this.

I'm still sort of leaning towards changing $rule_data to be a new rule entity that was set up.

Controller:
```
$entity = $this->phpbb_container->get('phpbb.boardrules.entity')
    (set everything);
$operator->add_rule(lang, parent, $entity);
```

Operator
```
$entity->insert(lang);
$this->nestedset_rules->add_to_nestedset($entity);