(BMG) Support for Backup & Restore using MariaBackup for MariaDB databases

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The recommended utility for MariaDB is Maria Backup which allows to do a full backup as well as partial backup.

Let's follow the best practices, that's how the Backup Repository should work, to natively integrate with systems.

Resources:

• https://mariadb.com/kb/en/partial-backup-and-restore-with-mariabackup/
• https://backup.ninja/news/mariadb-backups-what-is-mariabackup
• https://mariadb.com/kb/en/full-backup-and-restore-with-mariabackup/

In future we could also support incremental backups, when we will support incrementals at all: https://mariadb.com/kb/en/incremental-backup-and-restore-with-mariabackup/