fix: metafiles copying

[Julien-R44]

As you saw, cpy has had some breaking changes and they've changed their APIs. So if we follow their changelog, then you seem to have made the change the right way.
However, it seems to doesn't work as expected :

For a metaFiles pattern /resources/views/**.*.edge and the given directory structure :

  resources/
    views/
       view.edge
        admin/
            admin.edge

After copying, we will have this result in the ./build folder:

build/
  view.edge
  admin/
    admin.edge

I don't know why, I've tried a lot of different things to make it works but I think that it's a bug on the cpy side. so I suggest we just rollback temporarily. not super important I think

Also added a test that check we keep the original directory structure

[thetutlage]

Should we try with cpy@10.0?

[thetutlage]

Tracking it here. sindresorhus/cpy#113

Let's see if we can find a fix for this before downgrading the version

[thetutlage]

Let's merge it. It seems like a similar issue with cpy was reported last year and it is still pending.