Downloading artifacts from registry

[aguschin]

It would be very useful in user's workflow, if you could do

$ gto get -r $REPO myartifact --version v1 --output myartifact-v1
$ gto get -r $REPO myartifact --env prod --output myartifact-prod

Can this be achieved?

• What if Artifact is tracked with DVC?
• What if Artifact is a folder?

And OFC, there should be something similar in MLEM:

mlem.api.load(model, repo=repo, version="v1")

cc @shcheklein

[aguschin]

This should be done after DVC plugin is in place, as it doesn't make much sense for files lying in repo.

[aguschin]

After #25 it should be trivial to implement this for artifacts committed to the repo directly. So we can release it in the first GTO version, if we have time.