feat(store-ui): Add Skeleton Atom (#911)

* Add skeleton atom

* Move animation to theme

* Import tailwind utilities

* Update test

* Use only 1 div

* Update story

* Extend HTMLDivElement

packages/store-ui/src/index.ts

@@ -47,6 +47,9 @@ export type { SpinnerProps } from './atoms/Spinner'
 export { default as List } from './atoms/List'
 export type { ListProps } from './atoms/List'
 
+export { default as Skeleton } from './atoms/Skeleton'
+export type { SkeletonProps } from './atoms/Skeleton'
+
 // Molecules
 export { default as Bullets } from './molecules/Bullets'
 export type { BulletsProps } from './molecules/Bullets'