Add option for a CORS check to WMS/WFS probes

[pvgenuchten]

Last month we ran into a problem that CORS was broken on our services due to a k8s ingress update, unfortunately we only noticed some weeks later. Would be good to have the option to activate a CORS header check on our WMS/WFS probes

The check would validate if a header "Access-Control-Allow-Origin: *" exists (or with a parameter to set * to a selected domain).