Support Unity 6.7 content directory analysis (ContentLayout.json v3)

The schema of ContentLayout.json is changing between Unity 6.6 and 6.7 which breaks the ability to fully analyze content directory builds generated by Unity 6.7.

We need to update the support and try to maintain support for Unity 6.6 builds (the v2 schema). One approach might be to translate v2 to v3 files, and then only have support for importing the v3 data structures, this should be technically feasible because the changes only remove and reorganize data, no new data is added.

As part of this work https://github.com/Unity-Technologies/UnityDataTools/blob/main/Documentation/contentlayout.md should be reviewed to make sure it is accurate for both 6.6 and 6.7.

Commencez par examiner le chemin existant d’importation et d’analyse de ContentLayout.json, en comparant les schémas Unity 6.6 v2 et 6.7 v3 décrits dans l’issue. Examinez ensuite Documentation/contentlayout.md pour vérifier son exactitude dans les deux versions ; le travail est considéré comme terminé lorsque les builds du répertoire de contenu de 6.7 sont entièrement analysables, tout en continuant à prendre en charge les builds 6.6 v2.