️🛠 - Add setting for allowed file types

[MarkNerdi]

Description

Currently we try to download all images, videos (and audio in the future). The users should be able to specify which types they want and don’t want. We need a setting where the user can select those types.

Requirements

• [ ] Add Setting section for allowed file types
• [ ] Add checkboxes for “Image”, “Video” and “Audio”
• [ ] Use allowed file types in pre-download validation

Checklist

• [ ] I have linked the correct milestone and/or project(s)
• [ ] I have added the appropriate labels
• [ ] I have assigned this task to the correct people