Implement lazy subscriptions to playerState / playerContext events on android

Right now on android the `playerState` and `playerContext` events are subscribed to when the remote API is connected to Spotify. This subscription should be deferred until someone actually wants events from the remote.

In iOS there is bookkeeping that takes care of this, we need the same for android. Might also be worth investigating using the built in React Native events instead of having the dependency on the `react-native-events`