Command: Generate non-resident ECC key

[szszszsz]

Closing this issue and similar ones as done.

Implementation is provided in Nitrokey FIDO2 firmware repository, branch nitrokey-webcrypt. Tests are located in ./tests/webcrypt-tests/. Documentation provided in current repository for the reference at implementation.md. Direct links:

• https://github.com/Nitrokey/nitrokey-fido2-firmware/tree/nitrokey-webcrypt
• https://github.com/Nitrokey/nitrokey-fido2-firmware/tree/nitrokey-webcrypt/tests/webcrypt-tests
• https://github.com/Nitrokey/nitrokey-webcrypt/blob/master/implementation.md