Add trussed abstraction and nkpk subcommand

[robin-nitrokey]

This PR adds a new abstraction layer by extracting most of the functionality from the nk3 module to a trussed module and introduces the nkpk subcommand that uses this abstraction.

Currently available commands for nkpk:

• list
• provision fido2
• reboot
• rng
• status
• test
• version

[daringer]

did some testing on this to find a regression, but nothing so far... nice!
tested with: nk3am + nk3an means mostly the nk3 and fido2 sub-commands - not yet tested with the nkpk

lgtm!

[sosthene-nitrokey]

I get an error when doing nitropy ilst:

Critical error:
An unhandled exception occurred
	Exception encountered: AttributeError("'NoneType' object has no attribute 'device_name'")

It looks like the list method in cli/trussed/__init.py gets a None context.

[robin-nitrokey]

Ah, good catch. That’s due to this ugly hack:

pynitrokey/pynitrokey/cli/__init__.py

Lines 106 to 110 in 9703773

	def _list():
	fido2.commands["list"].callback()
	start.commands["list"].callback()
	nk3.commands["list"].callback()
	nkpk.commands["list"].callback()

Maybe there is a typesafe replacement for this code.

[robin-nitrokey]

Should be fixed now.