/**
* Read the configured content-level permissions for the item of the given type and ID.
+ *
* 'contentType' should be one of: page, book, chapter, bookshelf.
* 'contentId' should be the relevant ID of that item type you'd like to handle permissions for.
+ *
* The permissions shown are those that override the default for just the specified item, they do not show the
* full evaluated permission for a role, nor do they reflect permissions inherited from other items in the hierarchy.
* Fallback permission values may be `null` when inheriting is active.
/**
* Update the configured content-level permission overrides for the item of the given type and ID.
* 'contentType' should be one of: page, book, chapter, bookshelf.
+ *
* 'contentId' should be the relevant ID of that item type you'd like to handle permissions for.
* Providing an empty `role_permissions` array will remove any existing configured role permissions,
* so you may want to fetch existing permissions beforehand if just adding/removing a single item.