Expose normalized author data structure to listings

[rgaiacs]

Description

Quarto creates a normalized author data structure, see https://quarto.org/docs/journals/authors.html#author-metadata, that is available to Pandoc templates. For example,

<div class="authors">
    <p>Authors(s)</p>
    <ol>
        $for(authors)$
        <li>
            $authors.name.literal$
        </li>
        $endfor$
    </ol>
</div>

works when used as a partial template in _quarto.yml:

format:
  html:
    theme: cosmo
    template-partials:
      - _partials/title-block.html

Metadata read from the front matter of the document can be used when creating a custom listing, see https://quarto.org/docs/websites/website-listings.html#listing-fields. Unfortunately, the normalized author data structure is not exposed. For example,

<% method.authors.forEach(function(author){ %>
  <%= author.name.literal %>.
<% }); %>

gives me ERROR: TypeError: Cannot read properties of undefined (reading 'forEach').

Will be great to have the normalized author data structure also available to listing.