Describe the feature or problem you’d like to solve

GitHub repos provide an autolink feature to reference external resources from PR descriptions and other markdown fields. Autolink configuration is exposed via the GitHub REST API, but not via this CLI.

Proposed solution

I propose adding repo autolink reference CRUD features to the gh repo command.

Additional context

I'd be happy to attempt the implementation of this feature myself. I'm posting it as an issue to understand whether such a feature is desired and if so whether there might be some non-obvious challenges to its implementation.