[FEATURE] Support sk-ssh-ed25519 keys stored at Yubikey

[S-o-T]

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Is your feature request related to a problem? Please describe.

sk-ssh-ed25519 keys seems to be unsupported, following message displayed on pull attempt: "Don't know how to decode key:unknown"

Describe the solution you'd like

Add support for sk-ssh-ed25519 keys stored in yubikey.

Describe alternatives you've considered

Nothing.

Additional context

No response

[msfjarvis]

tadfisher appears to have made significant progress on using PGP keys over USB/NFC so there should be news on this front sooner than later.

[sebastianrasor]

It'd be awesome to see this implemented, I'm not sure if sk SSH keys can be read over NFC though

[SpyHoodle]

@sebastianrasor They can - Termius does this on iOS and I have used this feature before