[Feature Request] Allow to add more than one tag at once

[aledeg]

I would like to do something like

nexus-cli image delete --name foo/bar --tag 1.1 --tag 1.2 --tag 1.3

or like

nexus-cli image delete --name foo/bar --tags 1.1,1.2,1.3

[omerkarabacak]

I have a PR for this feature request.