CLI: Benchmarks and Groups

Evaluate, inspect, and release commands take --benchmark ORG/NAME or --group SLUG in place of --repo.

Command	Does
`benchmarks` · `benchmark add\|show\|tasks\|remove ORG/NAME[@REF]`	Harbor registry datasets
`groups` · `group show\|delete SLUG`	Repository groups
`group create\|update SLUG --name NAME --member OWNER/NAME [--member ...]`	Pool connected repositories

Benchmarks are never released.