Implement interface for enrichments about gto HOT 4 CLOSED

While using artifact registry, it could be the case when artifact itself was updated and enrichments are no longer correct.
$ gto describe should warn a user about these cases. It could be good if we could include this in #52 to get at least some idea how it should be done.

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As mentioned by @shcheklein, when DVC is installed as binary, GTO may not be able to discover DVC Python API. We need to support CLI as a fallback then. As an option, we can list dvc and mlem in config file gto.yaml so GTO will know what to search for.

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@mike0sv have created a good PR #52 that showcase how this should work. It's decided to postpone this functionality and implement it for the next product release.

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As a part of this task, we need to think about how to show discovered models in Studio MR. How it will be handled? How we'll show MLEM-only models there? Do you hide a MLEM model once GTO annotation matches the path (including previous commits)?

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