Migration cli

This MR adds a command-line interface for migrating from an old system to a new system.

Currently are supported: drs migration: writes config in old file.py into drs_config.toml file database migration: add the content of an old database to the new one and creates missing columns that are needed in the new system. @b324031 and @k204229 I guess you might want to have a look at this as you'll be using this.