SMQ-2705 - Add list groups with no parent group

[felixgateru]

What type of PR is this?

This is a feature becasue it adds the functionality to list groups which do not have a parent group

What does this do?

This pr adds a query parameter to ListGroups endpoint to be able to list groups which do not have a parent group.

Which issue(s) does this PR fix/relate to?

• Resolves Feature: List groups with no parent group #2705

Have you included tests for your changes?

Yes

Did you document any new/modified feature?

No

Notes

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 6 lines in your changes missing coverage. Please review.

Project coverage is 41.70%. Comparing base (7667eee) to head (41c2377).

Files with missing lines	Patch %	Lines
groups/api/http/decode.go	80.00%	2 Missing and 1 partial ⚠️
groups/postgres/groups.go	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2708      +/-   ##
==========================================
- Coverage   42.08%   41.70%   -0.39%     
==========================================
  Files         341       24     -317     
  Lines       47488     5076   -42412     
==========================================
- Hits        19987     2117   -17870     
+ Misses      25318     2792   -22526     
+ Partials     2183      167    -2016     

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