avc get using commit hash

[zamzz]

For me using tags as references in the avc get command works (avc get -o workspace repo@v1), but using commit hashes doesn't (avc get -o workspace repo@4a26495a). I did some digging and to me it seems to be caused by the get function adding NoFetch: true to the pull options. I was wondering why this option is set to true, as it seems to break this functionality?

https://github.com/InfuseAI/ArtiVC/blob/76a47f0105538a7511742f154c0da22ae0372eec/cmd/get.go#L57