SshKeyType
SSH public-key type names (RFC 4253 §6.6, RFC 5656 §6.2, RFC 8709 §4) this module reads and writes.
type SshKeyType = "ssh-rsa" | "ssh-ed25519" | "ecdsa-sha2-nistp256" | "ecdsa-sha2-nistp384" | "ecdsa-sha2-nistp521"
