Add further media information on the media_duplicates and media_duplicates_merge overview page

Problem/Motivation

Currently, both the media_duplicates and media_duplicates_merge overview page don't provide much information about the duplicate media entities in each row. This is especially annoying for "media_duplicates_merge" when deciding which media entity to keep.

Steps to reproduce

Proposed resolution

Add further information for each media entity duplicate like:

• Media Source file name (via the media entity type setting => Get the field value)
• Alt-Text (for images, if the core generated "field_media_image" field exists on the image)
• Title (for images, [...] (see above))
• (Optional) Provide a settings page to select, which field_value to show on the overview page

How exactly we want to display the informations is a bit unclear. We could introduce some kind of hover behavior, but then it is not very easy to compare each duplicate. Maybe an expandable container per media duplicate entry could be what we need.

Remaining tasks

User interface changes

API changes

Data model changes