use types for query parameters

[juliuste]

Disclaimer: Sorry for opening yet another issue, please close if out of scope/not useful. I'm currently integrating this library into a project that previously had a hand-written openapi doc, so I'm creating an issue here everytime I encounter a situation where the library doesn't (yet) allow what can be achieved by hand.

It seems like the library currently ignores type information for query parameters, even though the OpenAPI spec allows this (e.g. restricting a query parameter to an enum or even a number). Not sure if this was intentional or not.