feat(zkstack_cli): Autocompletion support

[manuelmauro]

What ❔

Add autocomplete feature to zkstack:

❯ zkstack
chain              dev     -- Chain related commands                                                                                                                   
consensus                  -- Update ZKsync                                                                                                                            
containers                 -- Run containers for local development                                                                                                     
contract-verifier          -- Run contract verifier                                                                                                                    
ecosystem                  -- Ecosystem related commands                                                                                                               
explorer                   -- Run block-explorer                                                                                                                       
external-node              -- External Node related commands                                                                                                           
help                       -- Print this message or the help of the given subcommand(s)                                                                                
markdown           update  --                                                                                                                                          
portal                     -- Run dapp-portal                                                                                                                          
prover                     -- Prover related commands                                                                                                                  
server                     -- Run server

❯ zkstack ecosystem                   
build-transactions    -- Create transactions to build ecosystem contracts
change-default-chain  -- Change the default chain
create                -- Create a new ecosystem and chain, setting necessary configurations for later initialization
help                  -- Print this message or the help of the given subcommand(s)
init                  -- Initialize ecosystem and chain, deploying necessary contracts and performing on-chain operations
setup-observability   -- Setup observability for the ecosystem, downloading Grafana dashboards from the era-observability repo

Why ❔

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• Code has been formatted via zkstack dev fmt and zkstack dev lint.

[Deniallugo]

just nits