[Glitch] Implement adding a user to a list from their profile

Port bb5558de62 to glitch-soc

app/javascript/flavours/glitch/features/ui/components/modal_root.js

@@ -19,6 +19,7 @@ import {
   SettingsModal,
   EmbedModal,
   ListEditor,
+  ListAdder,
   PinnedAccountsEditor,
 } from 'flavours/glitch/util/async-components';
 
@@ -36,6 +37,7 @@ const MODAL_COMPONENTS = {
   'ACTIONS': () => Promise.resolve({ default: ActionsModal }),
   'EMBED': EmbedModal,
   'LIST_EDITOR': ListEditor,
+  'LIST_ADDER':ListAdder,
   'FOCAL_POINT': () => Promise.resolve({ default: FocalPointModal }),
   'PINNED_ACCOUNTS_EDITOR': PinnedAccountsEditor,
 };