feat: add Group Managers and Group Teams API support

[innomaxx]

Closes #198

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.38%. Comparing base (192ac0d) to head (b80bfe2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #200      +/-   ##
==========================================
+ Coverage   99.37%   99.38%   +0.01%     
==========================================
  Files         169      169              
  Lines        7069     7161      +92     
  Branches      159      162       +3     
==========================================
+ Hits         7024     7116      +92     
  Misses         30       30              
  Partials       15       15              

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