create static method
Factory constructor that initializes the public key
Implementation
static Future<Ed25519PrivateKey> create(crypto.SimpleKeyPair keyPair, [Uint8List? privateKeyBytes]) async {
final algorithm = crypto.Ed25519();
final publicKeyObj = await keyPair.extractPublicKey();
final publicKey = Ed25519PublicKey(publicKeyObj);
return Ed25519PrivateKey._(keyPair, publicKey, privateKeyBytes);
}