Provide or more twig extensions to print media attributes

Problem/Motivation

The details of the filesize and other media properties are currently buried in the field formatter.

If I need to have several differently themed download buttons in my design but want to keep the rest of the attributes I can't rely on the field formatter - even with the theme template approach proposed in #3059830.

Proposed resolution

Write a service that get's the media details. Use the same service to calculate properties for the field formatter and for a new Twig extension.

Remaining tasks

• Write code.
• Write tests.

User interface changes

None.

API changes

A new twig extension should be available. Ideally it would be something like the link function but with media download attributes preset.
https://www.drupal.org/docs/theming-drupal/twig-in-drupal/functions-in-t... →

Data model changes

None.