encrypt method
Implementation
@override
Future<String?> encrypt(String msg, String destPubKey, {String? id}) async {
  final request = BunkerRequest(
    method: BunkerRequestMethods.nip04Encrypt,
    params: [destPubKey, msg],
  );
  final encryptedText = await remoteRequest(request: request);
  return encryptedText;
}