feat: Add backup and restore procedures

[ghislainbourgeois]

Description

Add backup and restore procedures, referring to mongodb-k8s documentation as much as possible. This procedure currently only works as a disaster recovery procedure, requiring a full redeployment of SD-Core.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [ ] I have added tests that validate the behaviour of the software
• [ ] I validated that new and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules
• [ ] I have bumped the version of the library