feat: add new url from role groups

[novakzaballa]

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Changes

• Add new URLs for role groups:

GET: organisations/{organisation_pk}/groups/{group_pk}/roles/
DELETE: organisations/{organisation_pk}/groups/{group_pk}/roles/{id}/

How did you test this code?

• Test in the RBAC PR: https://github.com/Flagsmith/flagsmith-rbac/pull/17

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[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (fc3bce0) 96.11% compared to head (940522c) 96.11%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
api/organisations/urls.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3178      +/-   ##
==========================================
- Coverage   96.11%   96.11%   -0.01%     
==========================================
  Files        1059     1059              
  Lines       32037    32076      +39     
==========================================
+ Hits        30792    30829      +37     
- Misses       1245     1247       +2     

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[zachaysan]

This PR is good, but in the future it would be helpful to get a link to the other matching PR in the other repository.

Also, I don't really understand why RolesByGroupViewSet is importable when the other repository hasn't merged it yet, but I'll leave the merging prioritization up to you.

[novakzaballa]

This PR is good, but in the future it would be helpful to get a link to the other matching PR in the other repository.

Good point, I shared all the related PRs in Notion and communicated via Slack, since we don't have other better way to manage subtasks in GitHub. Maybe the next time I will create a specific project for large features, however, part of this work already existed when I started working on it and I didn't realize that it would be necessary to change the API at that moment.

Also, I don't really understand why RolesByGroupViewSet is importable when the other repository hasn't merged it yet, but I'll leave the merging prioritization up to you.

It works maybe because its conditional use? Even when it is a bit counterintuitive that's the way it worked for this kind of multi-repo code in the past.