Product contribution role copyright-owner

[rduyme]

Hi,

Could you add role Product contribution role "copyright-owner" ?

https://skg-if.github.io/interoperability-framework/docs/research-product.html#contributions

http://purl.org/spar/pro/copyright-owner

we have at the moment roles : author, editor, and publisher.

Thanks,

request from Raul for RoHub/Ro-crate mapping.