feat: add support for group managers and teams

[andreichirila0712]

Summary

This introduces support for managing group managers and teams in the application.

Targets: issue#312

Changes

• Added models for GroupManager and GroupTeam, including response handling models (GroupManagerResponseList, GroupTeamResponseList, ...).
• Implemented endpoints to list, update, and retrieve group managers and teams.
• Added unit tests to verify the functionality of new endpoints.
• Included mock server data for API responses to ensure correctness.

Testing

• Mock data was added to test the newly API use cases like listing, retrieving, and updating group teams and managers.
• All tests passed successfully.

Additional notes

• New classes (e.g. GroupTeam) were created because the new API methods had response structures that differed from existing ones. For instance, the List Group Teams response includes a unique identifier and a nested team object, which matches the structure of the List Teams API.
• Existing models were reused in the newly models to avoid redundancy, but new classes were necessary to handle unique fields and correctly map the API responses as per the documentation.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.20%. Comparing base (47b3128) to head (9a622b4).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #313      +/-   ##
============================================
+ Coverage     94.14%   94.20%   +0.07%     
- Complexity      810      818       +8     
============================================
  Files           190      192       +2     
  Lines          2729     2758      +29     
  Branches         54       54              
============================================
+ Hits           2569     2598      +29     
  Misses          134      134              
  Partials         26       26              

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[andrii-bodnar]

@andreichirila0712 thank you!