* refactor: backup and restore to support cross device sync.
* chore: Updated string resources
* refactor: change function name.
* refactor: Use URI SyncHolder.kt not needed anymore.
(cherry picked from commit 7b2764e8f70ff4564fb744f48c1c53692f55f289)
# Conflicts:
# app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupManager.kt
# app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupRestorer.kt