feat(bbox): add GpfBbox dataclass to replace GpfExtent that should be a geometry
since GpfExtent will be changed by !68 (merged) a new class GpfBbox is added to read bbox from parameters
Voici la documentation : https://geoplateforme.pages.gpf-tech.ign.fr/documentation
since GpfExtent will be changed by !68 (merged) a new class GpfBbox is added to read bbox from parameters