Extract more info from exif to store on server

[tobiasKaminsky]

Right now we only extract size (width/height) and gps. While reading exif data, we could store way more to show on clients, without having them to download entire image: https://www.php.net/manual/en/function.exif-read-data.php

Alongside two other ideas

• store exif header in thumbnails/resized images so that clients can treat any image (original, thumbnail, resized image) with exif data
• make webdav property more generic, as we have right now two properties and with above we might end up with 10 different file_metadata_xyz properties

[AndyScherzinger]

Also referencing #39714