```release-note:enhancement
resource/aws_db_instance: Add support for `gp3` `storage_type` value
```

```release-note:enhancement
resource/aws_db_instance: Add `storage_throughput` argument
```

```release-note:enhancement
data-source/aws_db_instance: Add `storage_throughput` attribute
```

```release-note:enhancement
resource/aws_db_instance: Change `iops` to `Computed`
```