Add "My collections" page (#37552)

app/javascript/mastodon/features/ui/util/async-components.js

@@ -42,6 +42,12 @@ export function Lists () {
   return import('../../lists');
 }
 
+export function Collections () {
+  return import('../../collections').then(
+    module => ({default: module.Collections})
+  );
+}
+
 export function Status () {
   return import('../../status');
 }