Description of the problem, including code/CLI snippet

Right now there seems to be no way got get all the projects belonging to a particular (sub)group.
Something like
python-gitlab -c ~/.config/gitlab-cli project get --group mygroup

Expected Behavior

python-gitlab -c ~/.config/gitlab-cli project get --group mygroup
should checkout mygroup/prj1, mygroup/prj2, ... mygroup/prjN

Actual Behavior

The option doesn't seem to be available via cli.

Specifications

• python-gitlab version: 2.0.1
• API version you are using (v3/v4): v4
• Gitlab server version (or gitlab.com):gitlab.com