REQ: Add CLI commands for toggling low level features in DCT/DCD

[technobly]

One example of this can be found in the Docs here to regenerate device keys:
https://docs.particle.io/datasheets/cellular/e-series-datasheet/#dcd-layout

A command that lets you know you are toggling low level DCT/DCD features would be nice, like
particle dcd regen-keys-udp
particle dcd regen-keys-tcp
particle dcd setup-done-true
particle dcd setup-done-false
particle dcd power-management-detect-on
particle dcd power-management-detect-off
particle dcd tcp-fallback-on
particle dcd tcp-fallback-off
particle dcd p1-power-save-clock-on
particle dcd p1-power-save-clock-off
There might be more useful ones...