feature: implement groups

[earaujoassis]

closes #155

[codecov]

Codecov Report

Attention: Patch coverage is 81.18280% with 70 lines in your changes missing coverage. Please review.

Project coverage is 49.07%. Comparing base (786b55b) to head (1ac14b3).

Files with missing lines	Patch %	Lines
internal/api/users/groups_patch_handler.go	46.66%	21 Missing and 3 partials ⚠️
internal/api/users/groups_list_handler.go	57.89%	14 Missing and 2 partials ⚠️
internal/api/helpers/security.go	27.77%	13 Missing ⚠️
internal/api/helpers/permission.go	0.00%	12 Missing ⚠️
internal/notifications/notifier.go	16.66%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #168      +/-   ##
==========================================
+ Coverage   48.91%   49.07%   +0.16%     
==========================================
  Files         135      141       +6     
  Lines        5052     5119      +67     
==========================================
+ Hits         2471     2512      +41     
- Misses       2495     2517      +22     
- Partials       86       90       +4     

Flag	Coverage Δ
integration	72.72% <ø> (ø)
unit	49.02% <81.18%> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
internal/api/clients/create_handler.go	100.00% <100.00%> (ø)
internal/api/clients/credentials_handler.go	100.00% <100.00%> (ø)
internal/api/clients/endpoints.go	100.00% <100.00%> (ø)
internal/api/clients/list_handler.go	100.00% <100.00%> (ø)
internal/api/clients/profile_handler.go	100.00% <100.00%> (ø)
internal/api/endpoints.go	100.00% <100.00%> (ø)
internal/api/health_check/endpoints.go	100.00% <100.00%> (ø)
internal/api/health_check/handler.go	36.36% <100.00%> (ø)
internal/api/self/admin_handler.go	100.00% <100.00%> (ø)
internal/api/self/emails_create_handler.go	100.00% <100.00%> (ø)
... and 31 more

... and 2 files with indirect coverage changes

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