Get the package name from a folder path, including the scope if the
basename of the dirname starts with @.
For a path like /x/y/z/@scope/pkg it'll return @scope/pkg. If the path
name is something like /x/y/z/pkg, then it'll return pkg.
const nameFromFolder = require('@npmcli/name-from-folder')
const name = nameFromFolder('/some/folder/path')