Add an optional "write duplicate resources as symlinks"

[bep]

https://discourse.gohugo.io/t/page-resources-with-translated-pages/14829/3?u=bep

Optional as in default OFF (I'm not sure how widespread symlink support in web servers are + writing symlinks requires admin privileges on Windows).

[stale]

This issue has been automatically marked as stale because it has not had recent activity. The resources of the Hugo team are limited, and so we are asking for your help.
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[jmooring]

This will be addressed by #11453.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.