Wrap Auth controller for Android SDK

[jenow]

What does this PR do ?

Wrap Auth controller method for Android SDK in order to take and return JSONObject type when needed

How should this be manually tested?

run docker run --rm -it -v "$(pwd)":/go/src/github.com/kuzzleio/sdk-go android-x86 /build.sh
Use internal/wrappers/build/android/app/build/outputs/aar/app-release.aar in an android project and see if you have JSONObject type on the Auth controller's methods

[codecov-io]

Codecov Report

Merging #185 into 1.x will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              1.x     #185      +/-   ##
==========================================
+ Coverage   88.89%   88.98%   +0.09%     
==========================================
  Files         244      244              
  Lines        4413     4413              
==========================================
+ Hits         3923     3927       +4     
+ Misses        458      454       -4     
  Partials       32       32

Impacted Files	Coverage Δ
realtime/join.go	78.37% <0%> (+5.4%)	⬆️
realtime/subscribe.go	77.14% <0%> (+5.71%)	⬆️

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[Aschen]

Do we have to do this for every controllers ?

[jenow]

@Aschen Every controller which contains methods with String which represents a JSON