List forks

[cdlm]

Describe the feature or problem you'd like to solve
I'd like to be able to list the forks of a repo.

Propose a Solution
Add a --forks flag to the repo list subcommand introduced in #906 :

$ glab repo -R myself/foo-project list --forks
colleague/foo-project
contributor/foo-project
someone/renamed-foo

Additional context
We use gitlab for teaching: students fork a template repo with the exercise boilerplate, commit on their fork. For grading we go through all forks of the template repo.

[clemsbot]

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