feat(gnoland): Improve `gnoland config/secrets` command description

[gfanton]

Depends on:

• #2393

This PR improves the gnoland config get/set and gnoland secrets get commands by adding a description for each subcommand dynamically based on the config tags name and comment. The first line of the comment will determine the command ShortHelp. The entire comment will determine the LongHelp.

Demo:

Contributors' checklist...

• [ ] Added new tests, or not needed, or not feasible
• [ ] Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• [ ] Updated the official documentation or not needed
• [ ] No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• [ ] Added references to related issues and PRs
• [ ] Provided any useful hints for running manual tests
• [ ] Added new benchmarks to generated graphs, if any. More info here.