Add icon to field overview page

Problem/Motivation

Since Drupal 10.2, a New API for defining field type categories → exists.
It allows for an icon on the 'Add field' page:

For that, a proper icon must be defined.

A blog how-to is here: https://blog.horizontaldigital.com/add-icon-your-custom-field-type-drupa...

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes