feat(core): Added support for stacks in layout

sites/shared/components/workbench/draft/stack.js

@@ -0,0 +1,20 @@
+import Part from './part'
+import { getProps } from './utils'
+
+const Stack = props => {
+  const { stackName, stack, patternProps, gist, app, updateGist, unsetGist, showInfo } = props
+
+  return (
+    <g {...getProps(stack)} id={`stack-${stackName}`}>
+      {[...stack.parts].map((part) => (
+        <Part {...{ app, gist, updateGist, unsetGist, showInfo }}
+          key={part.name}
+          partName={part.name}
+          part={part}
+        />
+      ))}
+    </g>
+  )
+}
+
+export default Stack