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

{
    assert(conn_type != ConnectionType::INBOUND);
    
    
    
    if (interruptNet) {
        return;
    }
    if (!fNetworkActive) {
        return;
    }
    if (!pszDest) {
        bool banned_or_discouraged = m_banman && (m_banman->IsDiscouraged(addrConnect) || m_banman->IsBanned(addrConnect));
        if (IsLocal(addrConnect) || FindNode(static_cast<CNetAddr>(addrConnect)) || banned_or_discouraged || FindNode(addrConnect.ToStringIPPort())) {
            return;
        }
    } else if (FindNode(std::string(pszDest)))
        return;
    CNode* pnode = ConnectNode(addrConnect, pszDest, fCountFailure, conn_type);
    if (!pnode)
        return;
    if (grantOutbound)
        grantOutbound->MoveTo(pnode->grantOutbound);
    m_msgproc->InitializeNode(pnode);
    {
        LOCK(cs_vNodes);
        vNodes.push_back(pnode);
    }
}
void CConnman::ThreadMessageHandler()