[feature] support of $ref in contact fields

[LasneF]

given we handle a lot of Open API specification given the fact that contact are mostly always the same

it would be great that $ref being supported for the field contact

this feature is not a breaking change could be added either to moonwalk project or beeing a feature candidate for 3.2.X

following this pattern

contact: $ref: ../_shared/contact.yaml

this would requires a change in the meta schema

[LasneF]

if the contact fields will be updated as this ticket , https://github.com/OAI/OpenAPI-Specification/issues/1589

This feature could be included as part of the 2024 initiative https://github.com/OAI/OpenAPI-Specification/issues/3516

[handrews]

Consolidating under #3853 and closing