[Feature request] Query string with different encoding/encoder?

[iku000888]

https://github.com/arachne-framework/arachne-http/blob/master/src/arachne/http.clj#L88

In some parts of the world, non utf-8 encoding is required which are known to not work with the java.net.URLEncoder. (Namingly Shift_JIS).

It would be nice if there is a way to provide alternative encoding mechanisms such that I can encode the query string with the commons-codec library.