Before Qt 6 QStringRef could speed up the use of several QString-related operations. Clazy offered the check qstring-ref for this. With Qt 6 QStringRef is gone and QStringView plays a similar role. We should add a new check that points out perfomance gains by using QStringView-based functions. Related discussions: https://invent.kde.org/sdk/clazy/-/merge_requests/232 https://invent.kde.org/sdk/clazy/-/merge_requests/240