wgl: support kopper

this is semi transposed from the dri version of kopper and mostly ignores
what wgl tries to do in order to let zink drive everything

Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <!16068>
175 jobs for !16068 with wgl in 51 minutes and 23 seconds (queued for 12 seconds)
latest merge request