[Feature] External SSD to NVMe Board Migration

[rootzoll]

With the new RPi5 it seems very likely that the future will move to NVMe SSDs that are connected directly with a board like: https://www.cnx-software.com/2023/11/16/raspberry-pi-5-m-2-hat-meet-pineberry-pi-hatdrive/

Running with an external SSD should still be supported and then in an recover/update it should also support to move/migrate Data from external SSD to internal NVMe.