QtNetworkAuth.QAbstractOAuth is missing modifyParametersFunction/setModifyParametersFunction

QAbstractOAuth in QtNetworkAuth is missing the modifyParametersFunction and setModifyParametersFunction methods, as specified in their C++ equivalent.

This greatly hampers the usability of QOAuth2AuthorizationCodeFlow when used from PySide because without setModifyParameterFunction it's impossible to inject parameters in OAuth requests.

 enum class Stage;

typedef std::function<void(Stage, QMultiMap<QString, QVariant>*)> ModifyParametersFunction;

ModifyParametersFunction modifyParametersFunction() const;
void setModifyParametersFunction(const ModifyParametersFunction &modifyParametersFunction);