support QUERY verb (RFC 10008)

[akhra]

https://datatracker.ietf.org/doc/rfc10008/

[akhra]

mainly opening the issue to check whether I should dust off my PR gloves... been out of the loop for half a decade, but servant was an everyday companion for several years prior and if extra hands would help on this I'd be happy to contribute!

[tchoutri]

@akhra Welcome back! We'd be happy to have you contribute to Servant for this new HTTP verb. :)

[sl1depengwyn]

@akhra have you started working on this yet? If you're busy or something like that, I'd like to give it a try myself

[akhra]

@sl1depengwyn I have not yet, been traveling. if you're interested and immediately able, go right ahead! and absolutely ping me here if you could use extra eyes or the like.