Feature introduce visible by attribute

[marmoure]

https://www.algolia.com/doc/guides/security/api-keys/how-to/user-restricted-access-to-data/
Following Algolia recommandation the visible_by attribute can be used to restrict data access
the indexer now has the option to add this attribute in collection.xconf

<collection xmlns="http://exist-db.org/collection-config/1.0">
    <index xmlns:r="http://raskovnik.org">
        <algolia>
            <namespaceMappings>
                <namespaceMapping>
                    <prefix>r</prefix>
                    <namespace>http://raskovnik.org</namespace>
                </namespaceMapping>
            </namespaceMappings>
            <index name="my-algolia-index-1" visibleBy="/path/to/unique-id/r:visibleBy">
               ...
            </index>
        </algolia>
    </index>
</collection>