docs: public void deleteAccount() throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
          Map<String, String> attributes = new HashMap<>();
          // To delete an account, we add a single attribute, "remove", that is blank.
          attributes.put("remove", "");
          Registration reg = new Registration(attributes);
          reg.setType(IQ.Type.set);
          reg.setTo(connection().getXMPPServiceDomain());
          createStanzaCollectorAndSend(reg).nextResultOrThrow();
      }