feat: Spaced avatar group style

[fmehta-eightfold]

SUMMARY:

Add spaced grouping for avatar group

GITHUB ISSUE (Open Source Contributors)

JIRA TASK (Eightfold Employees Only):

ENG-40399

CHANGE TYPE:

• Bugfix Pull Request
• Feature Pull Request

TEST COVERAGE:

• Tests for this change already exist
• I have added unittests for this change

TEST PLAN:

Pull the PR branch and run yarn and yarn storybook. Verify the Avatar Group stories behave as expected.

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@f2655aa). Click here to learn what that means.
Patch has no changes to coverable lines.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #550   +/-   ##
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  Coverage        ?   84.86%           
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  Files           ?      791           
  Lines           ?    16838           
  Branches        ?     5914           
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  Hits            ?    14290           
  Misses          ?     2482           
  Partials        ?       66           

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