Automatically publish Swagger :consumes for :form params

[ikitommi]

Currently, on has to add manually :swagger {:consumes ["application/x-www-form-urlencoded"]} to endpoints that accept :form params. This can be automated:

• if the endpoint has :form, but not :body params, the parameters-middleware & parameters-interceptor should publish the needed :consumes

example how to do that in the muuntaja-middleware

#84 will outdate this. But a quick-win while waiting for that.

EDIT: I think the Muuntaja Middleware/Interceptor should also be changed that if there are is :form, but no :body parameters defined, it will not push it's own swagger-data. Otherwise, the order of the mw matters (the last one overrides), which would be awful.

[Koura]

I'll take a go at this unless someone else is already working on it