feat(structures): make structures data shape multi level

* New migration to add parentId, ancestorsIds, childrenIds
* Update data structure of structure to reflect changes
* Little update to structure Factory function
* Add a helper function to check admin right on a structure (direct admin or ancestor admin)
* Update publications (structures, services), methods (structures, users, services) to reflect new rights logics
* Update test to reflect new rights logics
* Add one test for new getAllChilds method
* Add missing translations (i18n)