Using new GoogleSignInClient

[fjpamaral]

Hey @StasDoskalenko , I was wondering if there is any plan to implement the new GoogleSignInClient?
Noticed that there is a commented code in the GoogleFitManager to handle this sign in but not sure if it is just a matter of uncommenting or if there is anything else to implement. Do you intend to implement it anytime soon, if not, can you confirm if there is anything else to implement or is it supposed to work just by uncommenting it?

https://github.com/StasDoskalenko/react-native-google-fit/blob/master/android/src/main/java/com/reactnative/googlefit/GoogleFitManager.java#L255-L279