Client: async resources, make store reusable, move plugins and add getTaskFor getter (#8575)

Add library to manage async resource
Make Store reusable for easier testing
Move plugin to libs
Add getTaskFor getter with tests

website/client/components/userTasks.vue

@@ -8,7 +8,7 @@
 
 <script>
 import Task from './task';
-import { mapState } from '../store';
+import { mapState } from 'client/libs/store';
 
 export default {
   components: {
@@ -20,7 +20,7 @@ export default {
     };
   },
   computed: {
-    ...mapState(['tasks']),
+    ...mapState({tasks: 'tasks.data'}),
   },
 };
 </script>