To be able to label incoming tor connections as different from normal localhost connections in e.g. `getpeerinfo` and the peers list in the GUI it'd be useful to have them connect on an alternative local-only port. Or even better, a UNIX socket.

For manually set-up hidden services this would have to be configured manually and could add a `hsport` option or such. The external port would still appear as `XXXXXXXXX.onion:8333`, however internally it would redirect to a that port.

In the case of `torcontrol` this would be easy to set up automatically. It could add a new (localhost) binding port automatically and this code would have to be changed:
- https://github.com/bitcoin/bitcoin/blob/master/src/torcontrol.cpp#L441
- https://github.com/bitcoin/bitcoin/blob/master/src/torcontrol.cpp#L477

{
    if (m_next_send_inv_to_incoming < now) {
        
        
        
        m_next_send_inv_to_incoming = PoissonNextSend(now, average_interval_seconds);
    }
    return m_next_send_inv_to_incoming;
}
int64_t PoissonNextSend(int64_t now, int average_interval_seconds)
{
    return now + (int64_t)(log1p(GetRand(1ULL << 48) * -0.0000000000000035527136788 ) * average_interval_seconds * -1000000.0 + 0.5);
}
CSipHasher CConnman::GetDeterministicRandomizer(uint64_t id) const
{
    return CSipHasher(nSeed0, nSeed1).Write(id);
}
uint64_t CConnman::CalculateKeyedNetGroup(const CAddress& ad) const
{
    std::vector<unsigned char> vchNetGroup(ad.GetGroup(addrman.m_asmap));
    return GetDeterministicRandomizer(RANDOMIZER_ID_NETGROUP).Write(vchNetGroup.data(), vchNetGroup.size()).Finalize();
}