Add AvatarStack component

[Calvein]

🥰 Feature request

Motivation

We have the same component used in multiple product

Example

Possible implementations

TBD e.g:

<AvatarStack
  members={members}
  max={10}
/>

[iarmankhan]

I can pick up this component if no one is working on it.

[theo-mesnil]

Hi @iarmankhan😄

We are currently creating it on the design team, we keep you in touch when it's going to be ready for developement. Thanks for your proposal 🙂