Gcr.Certificate.prototype.get_subject_raw
function get_subject_raw(): [return_value: ByteArray, n_data: Number(gsize)] {
    // Gjs wrapper for gcr_certificate_get_subject_raw()
}
  Get the raw DER data for the subject DN of the certificate.
The data should be freed by using g_free() when no longer required.
- return_value
- allocated memory containing the raw subject 
- n_data
- The length of the returned data.