Provide async API for REST

[totkeks]

I just started using your library and noticed that all the REST calls are blocking. Have you thought about providing async alternatives so it can be used with background updates?

I know I might be able to subscribe to the websocket, but I thought it would be easier with the REST API.

[Voyz]

Hey @totkeks thanks for the question, it's absolutely a valid point to consider implementing it. At the moment I don't have resources to do it, but I'm happy to review a PR that would implement it if anyone would be interested to contribute it.