```release-note:enhancement
data-source/aws_msk_cluster: Add `bootstrap_brokers_sasl_iam` attribute
```

```release-note:enhancement
resource/aws_msk_cluster: Add `bootstrap_brokers_sasl_iam` attribute
```

```release-note:enhancement
resource/aws_msk_cluster: Add `iam` argument to `client_authentication.sasl` configuration block
```