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Use case description

AWS Schedules can have a dead letter queue configured, see AWS::Scheduler::Schedule DeadLetterConfig. Serverless should support this for schedule events with method scheduler.

This is related to #8379.

Proposed solution (optional)

See #12363. The property is called like the one in sns events redrivePolicy. We could make it an object deadLetterConfig with property arn or targetArn since it is an object in CloudFormation, which implies there could be more properties in the future.

functions:
  myFunction:
    handler: src/myFunction.handler
    events:
      - schedule:
          rate: cron(0 13 6 * ? *)
          method: scheduler
          name: my-schedule
          deadLetterTargetArn: !GetAtt MyDLQ.Arn