poc: frontend extensions

public/app/extensions/index.ts

@@ -0,0 +1,4 @@
+let components = (require as any).context('.', true, /\.tsx?/);
+components.keys().forEach(key => {
+  console.log('extension component', components(key));
+});

public/app/extensions/test/test.ts

@@ -0,0 +1,3 @@
+export class Tester {}
+
+console.log('Tester');

public/app/routes/routes.ts

@@ -1,5 +1,6 @@
 import './dashboard_loaders';
 import './ReactContainer';
+import '../extensions';
 
 import ServerStats from 'app/features/admin/ServerStats';
 import AlertRuleList from 'app/features/alerting/AlertRuleList';