[Feature] Give possibility to import backup and restore database

[bastien70]

An interesting idea in my opinion would be to offer the possibility to users to restore a backup from a .SQL file to import.

A typical case (and one I've encountered) would be when developing a web application. We have the application in production, and in preproduction. Sometimes we need to transfer the database from prod to preprod. This is where I think DbSaver might be able to do this?