* Companion to `blockchain-info` Subcommand: #11250

* Rename to `chain-info`

* Remove `ensure_dev`

* Update cli/src/command.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Pin substrate `59a2150`

* `service::Block`

* Unused `chain_spec`

* fmt

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>