```release-note:enhancement
resource/aws_route53_delegation_set: Add `arn` attribute
```

```release-note:enhancement
resource/aws_route53_delegation_set: Add plan time validation for `reference_name`
```

```release-note:enhancement
data-source/aws_route53_delegation_set: Add `arn` attribute
```

```release-note:bug
resource/aws_route53_delegation_set: Properly remove from state when resource does not exist
```
