Support for detecting changes in webhooks

It would be nice to support API changes in webhooks defined with OpenAPI 3.1, in particular:

1. Detect if a webhook is removed
2. Detect changes in the webhook payload

Unfortunately it looks like now this is not possible.

This can be reproduced by doing:

    String oldSpec = Paths.get("webhook1.yml").toUri().toString();
    String newSpec = Paths.get("webhook2.yml").toUri().toString();

    ChangedOpenApi diff = OpenApiCompare.fromLocations(oldSpec, newSpec);

The content of boths specs are attached here (as .txt but they are .yml specs)

webhook1.txt

webhook2.txt

Note that no differences are found in this case

Comienza ejecutando la reproducción de OpenApiCompare.fromLocations con las especificaciones adjuntas webhook1.txt y webhook2.txt. Rastrea cómo se comparan los webhooks de OpenAPI 3.1 y, a continuación, verifica que eliminar un webhook y cambiar su payload se informen como diferencias. Se considera terminado cuando ambos casos producen diferencias para las especificaciones proporcionadas.