Add sb extract to enable Storybook composition

Ref: https://github.com/hashicorp/cloud-ui/pull/1457 and https://github.com/hashicorp/design-system-website/blob/main/taskbox/.storybook/main.js

addons/rose/package.json

@@ -25,7 +25,7 @@
     "test:ember-compatibility": "ember try:each",
     "prestorybook": "yarn build && yarn storybook:build",
     "storybook": "start-storybook -p 6006 -s dist",
-    "storybook:build": "build-storybook -s dist",
+    "storybook:build": "build-storybook -s dist && sb extract",
     "doc:toc": "doctoc README.md"
   },
   "dependencies": {
@@ -48,6 +48,7 @@
     "@storybook/addon-docs": "^6.3.8",
     "@storybook/addon-knobs": "^6.3.1",
     "@storybook/addons": "^6.3.9",
+    "@storybook/cli": "^6.3.10",
     "@storybook/ember": "^6.3.8",
     "@storybook/ember-cli-storybook": "^0.4.0",
     "babel-eslint": "^10.1.0",