Add `chain-info` Subcommand (#11250)

* Add `blockchain-info` Subcommand

* Update comment

* Cleanup

* Cleanup

* Use `sync_run`

* Use `sc_client_db` utility fns instead service backend

* Use service `Backend` builder

* Impl `From<sp_blockchain::Info>`

* Rename to `chain-info`

* fmt

* Copyright year

Co-authored-by: Bastian Köcher <[email protected]>

* Expose `DatabaseParams`

Co-authored-by: Bastian Köcher <[email protected]>