Support all 2FA types

[Kim Brose]

I've set up a Yubikey 5 NFC with both FIDO2 and Yubikey OTP 2FA methods. I can't log in due to

$ bitw sync
Password: 
error: invalid two-factor auth provider: "7"

Related: #15

Thanks for your work on this!

[Daniel Martí]

Indeed, these are TODOs. I only implemented the one that is easy to test locally, which is also what I use.