feat: added new avatar group component

[Rohitgomane]

What is Avatar group Component?

• This component allows you to group Avatars into single group.
• Useful when we need to display multiple number of users profile.

Appreciate your Feedback 😊

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[Wundero]

This duplicates https://github.com/shadcn-ui/ui/pull/2107, though I am not sure which would be a preferable implementation.