[REQUEST] Backup restores - Automatically re-download sources

[VibrantClouds]

Submitted for SlurpelDur#1421
Description
When restoring backups, if the system notices that a specific manga is saved under a source which is currently not installed, allow the system to download the associated source so that it may be displayed in the library without any additional user input.

How would it improve the App?
Users may forget what sources all of their manga have been saved under. When restoring a backup, sometimes there may be content which they aren't aware of, which simply isn't being displayed.

If the system were to automatically re-download all non-existing relevant sources, this would improve convenience

[VibrantClouds]

Alright, there's a few ways that this can be done.

• An identifier (Probably the Repository URL) can be added into each Bookmark Object/Whatever Object so that when it's backed up/restored, if it's not in the system already, it can be re-downloaded
• When the backup is made, the system saves with the JSON a list of all of the repo URLs, and the installed sources. When the backup is made, this list is restored.

Tbh, option one is trash. Option two seems doable.

[VibrantClouds]

Yup, option 2 was much easier.
Implemented and is pending review.

[github-actions]

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