Nunchuk Coldcard HSM

If the user is creating a wallet, also use nunchuk-wallet-creation.

If the user wants to create a wallet with Coldcard or add a Coldcard key, ask whether they want plain Coldcard signing or HSM mode before other Coldcard-specific setup questions, unless they already mentioned HSM.

Requires ckcc on PATH.

Install ckcc:

pip install 'ckcc-protocol[cli]'

Use Coldcard with Nunchuk