dvc: preserve comments/meta on add/imp/run #5001
Merged
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We load meta anyways, even with a quick parser, so we should just
attach it to the stage too, to make it less confusing. Comments require
some additional legwork, so those are restored separately, as they were
before. Though comments too should be restored more explicitly by the
serializer class (to be introduced in the future).
Pre-requisite for #4907
❗ I have followed the Contributing to DVC checklist.
📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.
Thank you for the contribution - we'll try to review it as soon as possible. 🙏