Register the `help` command
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Issue body
### What needs to get done
Register help as a command so it can provide help text for itself.
### Why it needs to get done
Consider the following user experience.
Rockcraft suggests using the `help` command:
```
> rockcraft help
Usage:
rockcraft [help] <command>
...
For more information about a command, run 'rockcraft help <command>'.
```
However, `help` does not have any help itself:
```
> rockcraft help help
Usage: rockcraft [options] command [args]...
Try 'rockcraft -h' for help.
Error: command 'help' not found to provide help for
```
Snapcraft is an interesting example because it has a help command registered in snapcraft_legacy.
Source: [LP#2043012](https://bugs.launchpad.net/snapcraft/+bug/2043012) from @brlin-tw
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