This method returns all possible available surveys that can be shown to the user. A list of survey objects is returned by this API.
Surveys.availableSurveys { (surveys) in
}
[IBGSurveys availableSurveysWithCompletionHandler: ^(NSArray<IBGSurvey *> *validSurveys) {
}];
Surveys.getAvailableSurveys();
Surveys.getAvailableSurveys(Function function)