Information on EG integrations is hard to find

[austencollins]

I'm trying to build tooling on top of the Event Gateway, but I'm unaware of the sinks that the EG can leverage and what their configuration needs are since there is no documentation on them. The EG OpenAPI is neat, but not super convenient as you have to follow a lot of the references.

Please add they types of functions the Event Gateway can interact with and what their configuration params are to this repo w/ examples.