List all groups on the OMERO database

[Rdornier]

Add a method to list all the groups on the current OMERO server. This method is restricted to admin people.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.64%. Comparing base (731293d) to head (d5431b1).
Report is 13 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #78      +/-   ##
============================================
+ Coverage     95.49%   95.64%   +0.15%     
- Complexity     1210     1256      +46     
============================================
  Files            46       46              
  Lines          3238     3398     +160     
  Branches        260      271      +11     
============================================
+ Hits           3092     3250     +158     
- Misses           85       87       +2     
  Partials         61       61              

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