Integrate meta-guf-distro/guf-image-extra

Commit: https://gitlab.com/garz-fricke/yocto/layers/meta-guf-distro/-/commit/77406f583040c65b6c645d000420a9143a470f0a

guf-image-extra: Extend guf-image instead of handle package list seperatly

The guf-image-extra ran out of sync with the guf-image. Now it includes guf-image.bb and only adds few packages. Added more examples and qmlbench.