add DialOption for adding a header#1

Draft

jscheithe wants to merge 4 commits intomasterfrom

Commits on Jun 14, 2023

add DialOption for adding a header
Jakob Scheithe
committed
fix type for ws.Dialer
Jakob Scheithe
committed
set dialHeader as extra argument to DialContext, instead of using a DialOption
Jakob Scheithe
committed
move dialHeader to RemoteAllocator to make it work with modifyURL
Jakob Scheithe
committed