Generate file extension mime type map with fileeye/mimemap update utility

Had a quick play with this. It would require adding the library as a production composer dependency and a bridge for our MimeTypeMapperInterface being added in 🐛 Separate MIME type mapping from ExtensionMimeTypeGuesser Needs work

Going to postpone on that for now.

Sophron 3.0.0-alpha1 → now no longer overrides Drupal's ExtensionMimeTypeGuesser, just the newly introduced MimeTypeMap.

Any review/input there appreciated.

@mondrake created https://www.drupal.org/project/sophron/issues/3519605 📌 SophronMimeTypeMapFactory should just override MimeTypeMapFactory::doCreateMap() Active