Hey thanks for writing this library, I know it's still early days for this library but I was wondering if there were any plans to add support for external refs?

e.g.

`$ref: "../resource.yml/#components/schemas/Hello"`

I had a play around enabling SwaggerLoader.IsExternalRefsAllowed but ran into this

Only local document components are supported

Happy to contribute a patch but before doing so was wondering if there was any reason in particular for not supporting this feature.