[MNT-21595] Content - Expose a group service for content

[mauriziovitale]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

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• Bugfix
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• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
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• Documentation
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If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

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[codecov-commenter]

Codecov Report

Merging #5833 into develop will decrease coverage by 0.03%.
The diff coverage is 44.44%.

@@             Coverage Diff             @@
##           develop    #5833      +/-   ##
===========================================
- Coverage    83.94%   83.90%   -0.04%     
===========================================
  Files          963      966       +3     
  Lines        27244    27259      +15     
  Branches      3799     3801       +2     
===========================================
+ Hits         22869    22871       +2     
- Misses        3237     3252      +15     
+ Partials      1138     1136       -2     

Impacted Files	Coverage Δ
...ission-manager/services/node-permission.service.ts	93.58% <0.00%> (ø)
...t-services/src/lib/group/services/group.service.ts	33.33% <33.33%> (ø)
lib/core/services/alfresco-api.service.ts	86.20% <50.00%> (ø)
lib/content-services/src/lib/group/index.ts	100.00% <100.00%> (ø)
lib/content-services/src/lib/group/public-api.ts	100.00% <100.00%> (ø)
lib/content-services/src/public-api.ts	100.00% <100.00%> (ø)
lib/core/services/translate-loader.service.ts	72.15% <0.00%> (-8.87%)	⬇️
... and 1 more

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