Add APIGatewayProxyRequestEvent

[andre-bisa]

This PR allows to create Lambda responding to an API Gateway using the Proxy integration. (linked to #48)

[armanbilge]

Thanks for the PR! We already have the V2 version of this event and an integration with http4s. Is there a significant motivation to support the legacy version as well?

feral/lambda/shared/src/main/scala/feral/lambda/events/ApiGatewayProxyEventV2.scala

Line 35 in 4ae770a

final case class ApiGatewayProxyEventV2(

[andre-bisa]

Hi @armanbilge,
It's mainly because the HTTP API cannot be set as private. We have a scenario where we use a private REST API with Proxy integration which still uses the old implementation (AFAIK V2 is only supported in the HTTP API).
I think this could be useful to other people as well tho.

[armanbilge]

Thanks for explaining! I guess for completeness we might consider adding an http4s integration for this event too, but that doesn't need to be this PR.