Create models for the myriad of AWS Lambda event types about feral HOT 2 OPEN

@armanbilge we talked on discord, for the purposes of project management I'll be looking at the SQS event first.

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@bpholt I've again arrived at the opinion that the CloudFormationCustomResourceEvent should probably join the rest of the events in this module 😅 these are my assumptions:

1. Not every event requires its own special lambda (like we have for http4s or CloudFormation). So this justifies the existence of the feral-lambda-events module, to host these events.
2. For consistency/least surprise, if some events are in feral-lambda-events, they should all be there :)

I could be wrong about (1). When we figure out how to deploy these things, maybe each type of Lambda will have to be treated differently anyway? I hope not.

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