export official addons (#604)

Author: manuel3108

packages/cli/lib/index.ts

@@ -1,3 +1,4 @@
 export { create } from '@sveltejs/create';
 export { installAddon } from './install.ts';
 export type { AddonMap, InstallOptions, OptionMap } from './install.ts';
+export { officialAddons } from '@sveltejs/addons';