Add setting to customize export name

Describe the feature Add a setting to customize the auto-export file name.

Describe alternatives you've considered (if applicable) Manually changing the file name or using e.g. Tasker.

Additional context I use the auto-export to backup Obtainium on my cloud service to make it easy to import it on a new phone. The problem is that the number of files increases without limit.

If i could keep only one file name, the backup on the cloud would be overwritten and i wouldn't end up with hundreds of files.