adding sanitizer filter for app

I'm adding a sanitize filter to be used whenever we want to escape tags that are generated from user input. In addition, I created a filters folder and a filter file that imports filters into the app

awx/ui/static/js/app.js

@@ -22,6 +22,7 @@ import 'tower/forms';
 import 'tower/lists';
 import 'tower/widgets';
 import 'tower/help';
+import 'tower/filters'; 
 import {Home, HomeGroups, HomeHosts} from 'tower/controllers/Home';
 import {SocketsController} from 'tower/controllers/Sockets';
 import {Authenticate} from 'tower/controllers/Authentication';