Add Wayland wrapper binary
Plasma Workspace expects a compositor wrapper binary to call into since MR520. Otherwise a Plasma Wayland session will exit early. Therefore we need to provide the wrapper binary as well.
The idea of the wrapper is to recover from compositor crashes as outlined in the original MR483. This functionality has not been tested with the MR here, but a KWinFT + Plasma Wayland session is functionally again.