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 (!AttemptToEvictConnection()) {
            
            LogPrint(BCLog::NET, "failed to find an eviction candidate - connection dropped (full)\n");
            CloseSocket(hSocket);
            return;
        }
    }
    NodeId id = GetNewNodeId();
    uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize();
    CAddress addr_bind = GetBindAddress(hSocket);
    ServiceFlags nodeServices = nLocalServices;
    if (NetPermissions::HasFlag(permissionFlags, PF_BLOOMFILTER)) {
        nodeServices = static_cast<ServiceFlags>(nodeServices | NODE_BLOOM);
    }
    CNode* pnode = new CNode(id, nodeServices, GetBestHeight(), hSocket, addr, CalculateKeyedNetGroup(addr), nonce, addr_bind, "", ConnectionType::INBOUND);
    pnode->AddRef();
    pnode->m_permissionFlags = permissionFlags;
    
    pnode->m_legacyWhitelisted = legacyWhitelisted;
    pnode->m_prefer_evict = discouraged;
    m_msgproc->InitializeNode(pnode);
    LogPrint(BCLog::NET, "connection from %s accepted\n", addr.ToString());
    {
        LOCK(cs_vNodes);
        vNodes.push_back(pnode);
    }
    
    RandAddEvent((uint32_t)id);
}
void CConnman::DisconnectNodes()