Nest some of the card component props under an image object

Overview

Follow up from https://git.drupalcode.org/project/experience_builder/-/merge_requests/1...

In https://www.drupal.org/project/experience_builder/issues/3535453 📌 Create an Image SDC that can be included by other SDCs Active a set of example card components was created, which contains a mixture of image related props (src, alt, width etc) and text relating to the card (e.g. content, footer). They are all top level props.

Additionally, look at renaming card-with-local-image to distinguish that it's testing any available image within the site, as opposed to the image shipped with the component.

Proposed resolution

Nest the image related props e.g. src becomes image.src