Is your feature request related to a problem? Please describe.

I'm always frustrated when we have a huge list of different commands in neofs-adm fschain.

Describe the solution you'd like

Make contract-level submenus like

netmap candidates
       remove-node
       config
       set-config
       new-epoch
container list
          quota
          estimations
balance get
        mint
...

Describe alternatives you've considered

Keep things as is, it works.

Additional context

#3572.