Switch Eventing and Alerting to use Lambda destinations

[kddejong]

Lambda can now direct the outputs to a destination making it easier to send alerts to event bridge, SNS, SQS, or another Lambda. https://aws.amazon.com/blogs/compute/introducing-aws-lambda-destinations/

By using this feature we could eliminate some code.

[eschwartz]

This is really cool. @kddejong -- can you specify multiple destinations? eg. have a Lambda return an API GW response, but also fire an SNS msg?

[kapilt]

apigw is a synchronous invocation, destinations are for async invocations.