message: 0-RTT stats for client
  Summary: not just qlogs, stats FTW
diff: @@ -618,11 +618,13 @@ void QuicClientTransport::processPacketData(
  if (conn_->qLogger) {
  conn_->qLogger->addTransportStateUpdate(kZeroRttRejected);
  }
  + QUIC_STATS(conn_->statsCallback, onZeroRttRejected);
  handshakeLayer->removePsk(hostname_);
  } else if (zeroRttRejected.has_value()) {
  if (conn_->qLogger) {
  conn_->qLogger->addTransportStateUpdate(kZeroRttAccepted);
  }
  + QUIC_STATS(conn_->statsCallback, onZeroRttAccepted);
  conn_->usedZeroRtt = true;
  }
  // We should get transport parameters if we've derived 1-rtt keys and 0-rtt
  