feat: add support for HTTP QUERY method

[jgresty]

The HTTP QUERY method is a means of making a safe, idempotent request that contains content. The primary motivator for this case is graphql, replacing HTTP POST for read only requests, however it is application agnostic.

This method is still in draft but stable enough where it is unlikely to change for this implementation.

https://httpwg.org/http-extensions/draft-ietf-httpbis-safe-method-w-body.html