Feature Request: Allow certificate types in ssh-keyscan -t

[Aaron Jones]

Hello.

I would like for the ssh-keyscan(1) -t argument (key type) to support
the certificate types too (such as ssh-ed25519-cert-v01 at openssh.com), as
from `ssh -Q key`.

This would allow to dump remote host certificates, useful for various
situations like certificate expiration monitoring.

Regards,
Aaron Jones

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