Simple RxTransformer example

Presenter(@NonNull RxTransformer rxTransformer,
          @NonNull Repository repository) {        
        mRxTransformer = rxTransformer;
        mRepository = repository;
    }
    
     void onLoadEvents() {
        mRepository.getEvent(id)
        .compose(mRxTransformer.chainSchedulers())
        .subscribe(event -> doSomething());
    }
    
    ...
    
    Usage:
    in some other class:
    
    Presenter presenter = new Presenter(new RxTransformer.DefaultRxTransformer(), someRepository);
    
    in tests:
    Presenter presenter = new Presenter(new RxTransformer.TestTransformer(), someRepository);