Allow to add rel attribute to the download link

rajat.dkte → made their first commit to this issue’s fork.

Patch applied please review the MR.

Hi @rajat4u, I've applied the provided MR as a patch and it applied without any errors. After applying the patch, the new configuration has been provided to add rel attribute to the formatter for both Image and File type fields. On enabling the rel attribute for the field, the rel attribute is being added to the DOM for download link. The provided new rel attribute configuration is working fine. I'm attaching the screenshots of before and after fixes for the issues and moving it to RTBC.

Thanks!