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

int port = default_port;
        SplitHostPort(std::string(pszDest), port, host);
        bool proxyConnectionFailed;
        connected = ConnectThroughProxy(proxy, host, port, hSocket, nConnectTimeout, proxyConnectionFailed);
    }
    if (!connected) {
        CloseSocket(hSocket);
        return nullptr;
    }
    
    NodeId id = GetNewNodeId();
    uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize();
    CAddress addr_bind = GetBindAddress(hSocket);
    CNode* pnode = new CNode(id, nLocalServices, GetBestHeight(), hSocket, addrConnect, CalculateKeyedNetGroup(addrConnect), nonce, addr_bind, pszDest ? pszDest : "", conn_type);
    pnode->AddRef();
    
    RandAddEvent((uint32_t)id);
    return pnode;
}
void CNode::CloseSocketDisconnect()
{
    fDisconnect = true;
    LOCK(cs_hSocket);
    if (hSocket != INVALID_SOCKET)
    {
        LogPrint(BCLog::NET, "disconnecting peer=%d\n", id);
        CloseSocket(hSocket);
    }
}
void CConnman::AddWhitelistPermissionFlags(NetPermissionFlags& flags, const CNetAddr &addr) const {