feat(events-targets): Add DLQ support for SNS target

[holomekc]

Describe the feature

For AWS event target SNS Topics can be used and at least in AWS UI it is possible to define a dead letter queue. Sadly this is not possible with CDK. Other Targets like SQS or EventBus does support it already. Check #16417.

Use Case

In case something does not work in event handling a dlq comes in handy, to see why event could not be handled.

Proposed Solution

import * as sns from "@aws-cdk/aws-sns";
import * as sqs from "@aws-cdk/aws-sqs";
import * as events from "@aws-cdk/aws-events";
import * as targets from "@aws-cdk/aws-events-targets";

const targetSQS = new sns.Topic(this, 'targetSNS', {
  topicName: 'targetSNS',
});

const rule = new events.Rule(this, 'rule', {
  eventPattern: {
    source: ["aws.ec2"],
  },
});

const myDeadLetterQueue = new sqs.Queue(this, 'myDeadLetterQueue');

rule.addTarget(new targets.SnsTopic(targetSNS, {
  deadLetterQueue: myDeadLetterQueue
}));

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

1.150.0

Environment details (OS name and version, etc.)

OSX 12.1

[rix0rrr]

A PR to add this is welcome

[github-actions]

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