Method Calls, Request and Response Objects have no Type Safety

[muruthi]

Current architecture:

String result;
    try {
      result = await _channel.invokeMethod('getRegisterUserWithBiometrics', {
        _reliantAppGuidKey: reliantApplicationGuid,
        _programGuidKey: programGuid,
        _consentIdKey: consentId
      });
    } on PlatformException {
      result = '';
    }

Improve architecture by wrapping the method calls in a dart class at the wrapper level with requests and response types defined