feat(msk): added msk cluster sasl iam public property

packages/@aws-cdk/aws-msk-alpha/lib/cluster.ts

@@ -894,6 +894,17 @@ export class Cluster extends ClusterBase {
     return this._bootstrapBrokers('BootstrapBrokerStringSaslIam');
   }
 
+  /**
+   * Get the list of brokers that a SASL/IAM authenticated client application can use to bootstrap
+   *
+   * Uses a Custom Resource to make an API call to `getBootstrapBrokers` using the Javascript SDK
+   *
+   * @returns - A string containing one or more DNS names (or IP) and TLS port pairs.
+   */
+  public get bootstrapBrokersPublicSaslIam() {
+    return this._bootstrapBrokers('BootstrapBrokerStringPublicSaslIam');
+  }
+
   /**
    * A list of usersnames to register with the cluster. The password will automatically be generated using Secrets
    * Manager and the { username, password } JSON object stored in Secrets Manager as `AmazonMSK_username`.

packages/@aws-cdk/aws-msk-alpha/test/integ.cluster.ts

@@ -195,7 +195,7 @@ class FeatureFlagStack extends cdk.Stack {
       removalPolicy: cdk.RemovalPolicy.DESTROY,
     });
     new cdk.CfnOutput(this, 'BootstrapBrokers9', { value: cluster7.bootstrapBrokersTls });
-
+    new cdk.CfnOutput(this, 'BootstrapBrokers10', { value: cluster3.bootstrapBrokersPublicSaslIam });
   }
 }