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)

app/imports/api/structures/server/utils.js

+import { Roles } from 'meteor/alanning:roles';
+import Structures from '../structures';
+
+export const hasAdminRightOnStructure = ({ userId, structureId }) => {
+  const ids = [structureId];
+  const structure = Structures.findOne({ _id: structureId }, { fields: { ancestorsIds: 1 } });
+
+  if (structure && structure.ancestorsIds.length > 0) structure.ancestorsIds.forEach((ancestor) => ids.push(ancestor));
+
+  const isAdmin = ids.some((id) => Roles.userIsInRole(userId, 'adminStructure', id));
+
+  return isAdmin;
+};
+
+export const isAStructureWithSameNameExistWithSameParent = ({ name, parentId }) => {
+  const regExp = new RegExp(name, 'i');
+  const structuresWithSameNameOnSameLevel = Structures.find({ name: { $regex: regExp }, parentId });
+
+  return structuresWithSameNameOnSameLevel.count() > 0;
+};