visgraph: adding endpoint to get list of relations

src/Bundle/ChillPersonBundle/Resources/public/vuejs/VisGraph/api.js

@@ -110,6 +110,14 @@ const getRelationshipsByPerson = (person) => {
         `/api/1.0/relations/relationship/by-person/${person._id}.json`)
 }
 
+/**
+ * Return list of relations
+ * @returns {Promise<Response>}
+ */
+const getRelationsList = () => {
+    return getFetch(`/api/1.0/relations/relation.json`)
+}
+
 /**
  * @function postRelationship
  * @param person
@@ -132,5 +140,6 @@ export {
     getHouseholdByPerson,
     getCoursesByPerson,
     getRelationshipsByPerson,
-    postRelationship
+    getRelationsList,
+    postRelationship,
 }