(aws-events-targets): Add DLQ Support for EventBus Target

[canpan14]

DLQ Support was added for most targets, but not for EventBus. I'm not sure if this was an oversight or wasn't possible at the time.

This is an available feature through the AWS Console already.

Use Case

Make it possible to attach DLQ to EventBus targets without the use of the AWS Console following the same strategy that other Targets have available to them.

Proposed Solution

import * as sqs from "@aws-cdk/aws-sqs";
import {EventBus, Rule} from '@aws-cdk/aws-events';
import {EventBus as EventBusTarget} from '@aws-cdk/aws-events-targets';

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

const myEventBus = new EventBus(this, 'EventBus', {
  eventBusName: 'someName',
});

const myRule = new Rule(this, 'myRule', {
  myEventBus,
  eventPattern: {
    detailType: ['detailType'],
  },
});

const someOtherEventBus = EventBus.fromEventBusArn(this, 'otherEventBus', 'otherEventBusArn);

// Currently deadLetterQueue is not an option
myRule.addTarget(new EventBusTarget(someOtherEventBus, {
  deadLetterQueue: myDeadLetterQueue
}));

Other

Associated Issue: #11612

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

---

This is a 🚀 Feature Request

[nirweiner2]

I would love to have this issue solved as well.
Following...

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