feat(events-targets): add support for AppSync as an EventBridge rule target

[onlybakam]

Reason for this change

Introduces support to configure AppSync GraphQLAPI as an EventBridge target.

• announcement: https://aws.amazon.com/about-aws/whats-new/2024/01/amazon-eventbridge-appsync-target-buses/
• documentation: https://docs.aws.amazon.com/eventbridge/latest/userguide/target-appsync.html

Description of changes

• Expose GraphQLEndpointArn attribute in L2 GraphQLAPI construct
• Implement events.IRuleTarget for AppSync

rule.addTarget(new targets.AppSync(api, {
  graphQLOperation: 'mutation Publish($message: String!){ publish(message: $message) { message } }',
  variables: events.RuleTargetInput.fromObject({
    message: 'hello world',
  }),
  deadLetterQueue: queue,
}));

Description of how you validated changes

unit test and integration tests

Issue

Solves #29884

Checklist

• [x] My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

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

[djbotha]

Hey @lpizzinidev & @onlybakam, thank you so much for your work on this feature. I'm new to the repo and wondering what the timeline would be to get this feature published, assuming it gets merged? Are we talking about days or weeks? :)

I have a new feature I'd like to build in my product, and this would greatly save development time. If it's coming soon, I'd rather wait until it's merged before I hand-roll a solution. 😄

[onlybakam]

hoping to get this done soon. will address the remaining comments in the next couple of days.

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[gracelu0]

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 87f427d3869eabe4a51acb9cbb44b8838cbbf802
• Result: SUCCEEDED
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[mergify[bot]]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[gracelu0]

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[gracelu0]

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