[wishlist] Automatically add merge request dependencies

[vectro]

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When creating stacked MRs in GitLab using git-town, it would be nice if Git Town were to automatically add a merge request dependency, so that the child branch cannot be merged before the parent branch. Probably this is only desired if the parent branch is not perennial.

See also GitLab documentation: https://docs.gitlab.com/ee/user/project/merge_requests/dependencies.html