feat: Added new attributes for fork endpoint

[maicol07]

Reference: https://docs.gitlab.com/ee/api/project_forks.html#fork-a-project

[MagnusHJensen]

Hey man, this is something I definitely could use right now.

Are you up for fixing the conflicts, but also not breaking the style guide? If not then I can make a new PR instead.

[maicol07]

Hey man, this is something I definitely could use right now.

Are you up for fixing the conflicts, but also not breaking the style guide? If not then I can make a new PR instead.

Hi, there aren't conflicts with the main branch of the original repo

[MagnusHJensen]

This PR fails with style conflicts, so yeah there is.

You have also modified the entire projects file where there is a string concat, so I would assume the authors/maintainers want that removed.

[maicol07]

Oh yes I can solve the style conflicts

[drumm]

This would be useful for me, too. It looks like the CI bot identified one remaining spacing issue.

I don't know if the maintainers will want to see the unrelated spacing-only changes in this PR.