addCertificate method
Добавить новый сертификат в формате Pfx
Implementation
@override
Future<Certificate> addCertificate({
  required File file,
  required String password,
  String? newPassword,
}) async {
  String response = await methodChannel.invokeMethod(
    "addPfxCertificate",
    {
      "path": file.path,
      "password": password,
      "newPassword": newPassword,
    },
  );
  Map<String, dynamic> map = json.decode(response) as Map<String, dynamic>;
  final certificate = Certificate.fromMap(map["certificate"]);
  return certificate;
}