As a user, I want image file metadata to be saved alongside the binary data

## Description

Currently, only the binary data of image files is saved, without metadata like file name, format, and size. This makes it difficult to determine the file type when fetching and displaying images.

## Acceptance Criteria

- When an image file is saved, its metadata is stored alongside it.
- The stored metadata includes, if available: file name, MIME type or format, dimensions (width, height), file size, sort order etc.
- Metadata can be retrieved when accessing an image file.
- Existing images without metadata remain accessible without issues.