Add schema migration framework for OC DB MySQL backend

* It provides migration indexed by a number
* It can apply/unapply migrations to a defined version
* It can list migrations applied or not
Add command to list migrations

Indicating whether they have been applied or not and in what date
Provide --migration-target-version to apply/unapply migrations

To a point in the migration list, if possible.

It only applies along with --migrate option