spec: introduce metapackages

Jan Staněkrequested to merge
jstanek-rh/nodejs-ng:metapackages into main

The sub-packages that should be installable via the version-agnostic method were provided with a corresponding meta-package:

  • nodejs
  • nodejs-full-i18n
  • nodejs-docs
  • nodejs-npm

They have no content as of now, so RPM does not actually generate them as separate rpms (yet). This should be fixed.

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