Change how we integrate spotify with Android

[gustavoggs]

Hey @cjam I was doing some tests and I believe that we should move how we do the android integration. We should move the dependency to be direct from auth library that Spotify now releases using maven. The other point is that other Spotify libs like the Flutter one you need to direct add the aar yourself, and I think we should do the same path.

I will send a PR with those ideas and we can discuss on top of it.

[cjam]

Sorry for the delayed response. Interesting thoughts. My goal initially was to try and keep the library as consistent across iOS and Android. I believe iOS includes all of the auth pieces and Android has two separate libraries. But, open to discussion on it for sure. Looking at a PR / code might help see the impact of a change like this.