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: <!16087>
177 jobs for !16087 with kopper-staging in 58 minutes and 44 seconds (queued for 7 seconds)
latest merge request