OpenApiComparer is not implemented

Hello,

My team is using this repository to generate our OpenAPI document, and we started using the OpenApiComparer recently in our project. This method returns a value so we believed it was working until recently when after making a change this still returned an empty list.

After looking at the implementation it's quite clear that this method does nothing but it is documented as being a method that "Compares two OpenApiDocuments and returns a list of differences.".

I believe this method should be removed or should throw instead.

After looking a bit more, there seems to be a valid implementation of this in the vnext branch that was never merged into master.

Comienza leyendo src/Microsoft.OpenApi/Services/OpenApiComparer.cs e inspecciona la implementación válida en la rama vnext. Determina si la resolución prevista es eliminar el método, hacer que lance una excepción o incorporar la implementación de vnext; la tarea estará terminada cuando OpenApiComparer ya no devuelva silenciosamente un resultado vacío para una comparación.