Wrap Document controller for Android SDK

[jenow]

What does this PR do ?

Wrap Document 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 Document controller's methods

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[scottinet]

I'm going to trust you (almost) blindly on that one 😲 👍

[jenow]

Well to shortly explain:

• I put the methods which should take or/and return a JSONObject instead of a String to private access
• I create new methods of the same name on public but this time with JSONObject parameter or/and return value instead of String
• Call the previously changed private method by instanciating a JSONObject from the String inside the newly created public methods

That's all :)

edit: Oh and of course I thought of adding the throws JSONException to the new methods signature