There is no way to configure SQS event handlers dynamically

[jiaaro]

In an app I work on we create SQS queues as part of deployment and, as a result, we don't know their ARNs before deploying the application. This makes it tricky to put those ARNs in our zappa_settings.yaml.

I propose a default_event_handler where users can set the path to a function to be called for any events which are not handled using the event handlers. This would provide an escape hatch for users like us, as well as a way for early adopters of new AWS technologies to use aws events that zappa doesn't explicitly support yet.

I have begun implementing this in my fork