Feature/search to datalab (#1245)

* add main stylesheet as css and separate it from app.vue

* add Chevron in icon

* Create ComposeSearchQuery.vue

* Update BDropdown.vue

* Update PowerVis.stories.js

* Create ComposeSearchQuery.stories.ts

* add interface FilterInterface to accomodate getQuery method in typescript

* Update ComposeSearchQuery.vue

* fix storybook and ts for the small dropdown component

* first version of query composer page

.storybook/preview.ts

@@ -9,6 +9,7 @@ import { handlers as mswHandlers } from './mswHandlers'
 import 'dripicons/webfont/webfont.css'
 import '../src/assets/legacy/bootstrap-impresso-theme.css'
 import '../src/assets/legacy/bootstrap-vue.css'
+import '../src/styles/style.css'
 
 /*
  * Initializes MSW