Responsive image formatter does not support URL/Link options

Problem/Motivation

Follow up issue for #2829990: Image formatter does not support URL/Link options →

When using a responsive image field formatter and adding a link to a file or hosting entity, URL options are not handled by the native image formatter so it is impossible to add a class or other attributes to the generated link...

function : template_preprocess_responsive_image_formatter
template : responsive-image-formatter.html.twig

Proposed resolution

Use the link() Twig method to render the linked responsive image, so URL options are output as expected.

Remaining tasks

1. Review
2. Commit

User interface changes

None.

API changes

Linked responsive images can now render link attributes.

Data model changes

None.