feat(msk-alpha): add brokerEndpoints property on cluster

[vdahlberg]

Reason for this change

Currently only some broker endpoints are retrievable;

new CfnOutput(this, 'BootstrapBrokers', { value: cluster.bootstrapBrokers });
new CfnOutput(this, 'BootstrapBrokersTls', { value: cluster.bootstrapBrokersTls });
new CfnOutput(this, 'BootstrapBrokersSaslScram', { value: cluster.bootstrapBrokersSaslScram });
new CfnOutput(this, 'BootstrapBrokerStringSaslIam', { value: cluster.bootstrapBrokersSaslIam });

While the BootstrapBrokers API can return many more.

The CustomResource used to fetch the brokers also use the first fetched responseField in the logical id;

  private _bootstrapBrokers(responseField: string): string {
    if (!this._clusterBootstrapBrokers) {
      this._clusterBootstrapBrokers = new cr.AwsCustomResource(this, `BootstrapBrokers${responseField}`, {

This means just changing the order, changes the logical id. Which isn't a breaking change as I understand, but a somewhat unnecessary behavioral change.

Description of changes

Introduced brokerEndpoints property which uses a custom resource to retrieve all bootstrap broker endpoints.
Keep old API for full backwards compability, but should probably be deprecated in the future.

Description of how you validated changes

Unit tests not really applicable.
Deploying minimal stacks and using cloudformation exports to export several various broker endpoints depending on cluster setup.
Updated integrations tests but can not run them unfortunately.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Features must contain a change to an integration test file and the resulting snapshot.

If you believe this pull request should receive an exemption, please comment and provide a justification. A comment requesting an exemption should contain the text Exemption Request. Additionally, if clarification is needed, add Clarification Request to a comment.

✅ A exemption request has been requested. Please wait for a maintainer's review.

[vdahlberg]

Exemption Request

I am not able to run the integration test and store the snapshot myself .
Can a maintainer help with this please?

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 374d92f
• Result: FAILED
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[GavinZZ]

Can you re-run the integration test and update the snapshot please?