The plugin doesn't support custom complex data types and lists of complex data types

The following property definitions of a computed field fail with `Missing type list` where `key_value` is a custom (complex) data type:

```
public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
$properties['tag'] = DataDefinition::create('string')
->setLabel(t('Tag'))
->setRequired(TRUE);
$properties['attributes'] = ListDataDefinition::create('key_value')
->setLabel(t('Attributes'))
->setRequired(TRUE);
return $properties;
}
```