Add support for scoped plugin packages

[kuoruan]

Is your feature request related to a problem?
No

Describe the solution you'd like
Add support for scoped package (eg. @google/verdaccio-google-auth-ui) as the plugin package name.

Describe alternatives you've considered
The config can be like:

auth:
  google-auth-ui@google:
    foo: bar

or:

auth:
  google-auth-ui:
    _scope: google # add prefix underline
    foo: bar

Leave blank can compatible with plugin named verdaccio-google-auth-ui

[edclement]

Maybe the below link will be helpful for you until something like what you're proposing is implemented. This is how we handle installing our plugin which is scoped under @xlts.dev.

https://github.com/xlts-dev/verdaccio-prometheus-middleware#installation

[juanpicado]

There was a first try already #1868

[juanpicado]

Second try #1868 (comment)
PR: #3227

[juanpicado]

From v5.12.0 would be like this #3227

middlewares:
  audit:
    enabled: true
  '@xlts.dev/verdaccio-prometheus-middleware':
      metricsPath: /custom/path/metrics