Passkeys: non deterministic Eddsa, key not compressed

[rdubois-crypto]

When creating a passkey with eddsa params, it appears that the algorithm is not properly implemented.
-> same challenge get different responses (RFC8032 is deterministic, as opposed to ECDSA)
-> KEY is twice long (as P256)

Everything seems to indicate that it is in reality P256 that is used, and that algoID is not checked.
(related to #2).

This is a security issue cause if another device implements Ed25519 properly, it will fail to have a backup in case of device loss in the Samsung.