Add backup and restore of fjall db snapshot#443

dlukegordon wants to merge 3 commits intomainMystenLabs/hashi:mainfrom

lukegordon/iop-319-add-backup-and-restore-of-fjall-db-snapshotMystenLabs/hashi:lukegordon/iop-319-add-backup-and-restore-of-fjall-db-snapshotCopy head branch name to clipboard