[Feature Request] Backup and restore, reset

### Checklist

- [ ] This feature I'm requesting is already implemented in yt-dlp.
- [ ] This feature is merely a UI/UX update.
- [X] This feature is suitable for primary users with little knowledge about yt-dlp.
- [X] This feature is available for most websites, not only the video platform I use.
- [X] This feature is suitable for a large variety of videos.
- [X] This feature is not going to conflict with many of the existing options.

### Is your feature request related to a problem? Please describe.

1.Option to backup and restore settings.Even if you delete the app by mistake, the data is backed up.😊

2.Also option to reset settings.

### Describe the solution you'd like

Backup and restore application settings.Also option to reset settings.

### Video link

All

### Additional context

Also option to reset settings.

The issue names no files, tests, or entry points. Start by locating the application's settings screen and settings persistence flow; clarify how backup and restore should work before implementing. Done means primary users can back up, restore, and reset application settings.

Written by the indexing model from the issue text.