cmd: Unwrap adapter modules to get underlying modules

[WeidiDeng]

Fix 5621.

In addition, this also fixed several add(remove)-package related commands as they can't be used to add or remove adapter related modules.

Before,

After,

[mholt]

Oh, thanks for this!

I was kind of thinking that we should rethink this command...

Technically, by "modules" I mean "config modules" i.e. an extension of the configuration.

I wonder if this command should actually be "list-plugins" to list all the plugins.

Or maybe the semantics shouldn't matter and we should just print everything.

The problem is that config adapters don't keep the same interface as a Caddy module... so we'd have to figure that out.

Can we talk about a fix where we don't wrap the adapters in the first place? I think I'd like that better. 😁

[WeidiDeng]

You mean adapters are not part of modules, and will not show as so. However, they will show in the new list-plugin command?

They are of course affected by add / remove package commands.

[WeidiDeng]

What should be the definition of a plugin? Maybe just config-adapters are more expressive?

[mholt]

Well, I'm not sure if a new list-plugins command is the right answer -- maybe it is. I need to think about it more, or maybe have a discussion about other good solutions.