VRR for Wayland
This patch implements variable refresh rate support for Wayland on the Gbm and EglStreams backends, for fullscreen and optionally also for desktop usage.
Depends on kwayland-server!190 (merged) and libraries/plasma-wayland-protocols!10 (merged). For the display settings also see https://invent.kde.org/frameworks/kwayland/-/merge_requests/22, libkscreen!20 (merged) and kscreen!19 (merged)