Async step1

[timbms]

Conformance with URLSessionDelegate, URLSessionTaskDelegate migrated to async/await

[digitaldan]

Thanks @timbms , i actually was hoping to get rid of this class altogether and instead refactor the Networking class to use the built in URLRequest / URLSession stuff (so remove AlamoFire). I have a working branch to do this, just taking me a bit of time to refactor. Once that happens, when can just use the one networking class instead of having two different ones.

Your changes i think would apply that refactor, let me get a PR up maybe this weekend for us to review.

[timbms]

I understand your intention to replace HTTPClient by the refactored Networking class. Ideally this should be done together with the usage of swift-openapi-generator because it allows to get rid of all the custom JSON decoding and to easily migrate to a web socket subscription.
This PR just carries over the compliance with the protocols URLSessionDelegate, URLSessionTaskDelegate to the async counterpart. When using URLSesssion this should be done anyway. If all goes well this is just an equivalent replacement for the functions using completion handler. This PR should be mergeable without any problem but of course it requires testing before a release.