Secrets App: improve UI/UX for Password Safe support

[x] change command names (improve UI)
- [x] Maybe add-otp and add-password? register could act as an alias for add-otp for compatibility and print a deprecation warning.
- [x] In that case I’d also use get-otp and get-password with get being an alias for get-otp.
[x] additional output presentation
- [x] It should be possible to only print the password for easy scripting.
- [x] A machine-readable output format could also be useful for more advanced use cases (CSV or JSON).
[ ] update credential feature
[x] check firmware / app version for the PWS features

Nitrokey / pynitrokey