Following up from a forum's thread on the topic, this bug is to capture the need to extend the dump-help serialization data structure to reflect that a command, as well as an argument, can be hidden from output.

Checklist

• If possible, I've reproduced the issue using the main branch of this package
• I've searched for existing GitHub issues

Steps to Reproduce

1. Establish an example command and mark it private
2. use the --experimental-dump-help on the resulting executable

Expected behavior

A "hidden" command should be annotated as such. Additionally, generate-manual should exclude content for that command.

Actual behavior

Hidden commands are exposed, and no data is included in the JSON representation that's made available in the dump-help serialization format.