Find a way to handle type alias

[fhgbaguidi]

Hello,
the idea behind this enhancement is to see whether the Open Api parser can handle type alias.
For example we can use something like:

// @openapi:schema
type Error = jsonapi.ErrorObject

instead of re-define (duplicate) the struct locally just to add @openapi:schema

This will allow to use external type to describe our API in the swagger file.

[alexjomin]

Hello, thank you. Sounds good to me, enhancement tag added !