ControllerMethodArgs does not support FormData

[Thesephi]

When retrieving request body with ControllerMethodArgs("body"), we can get the value as parsed from the body json payload.

But if the request comes from an HTML <form method="post"> element, the content-type is then likely application/x-www-form-urlencoded or multipart/form-data. Currently there's no supported way to conveniently extract data from the request for this scenario.

Of course we can do sth like await ctx.request.body.formData(), but would be nice if this library supports a syntactic sugar here as well?