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

#include <miniupnpc/miniupnpc.h>
#include <miniupnpc/upnpcommands.h>
#include <miniupnpc/upnperrors.h>
static_assert(MINIUPNPC_API_VERSION >= 10, "miniUPnPc API version >= 10 assumed");
#endif
#include <cstdint>
#include <unordered_map>
#include <math.h>
static constexpr std::chrono::minutes DUMP_PEERS_INTERVAL{15};
static constexpr int DNSSEEDS_TO_QUERY_AT_ONCE = 3;
/** How long to delay before querying DNS seeds
 *
 * If we have more than THRESHOLD entries in addrman, then it's likely
 * that we got those addresses from having previously connected to the P2P
 * network, and that we'll be able to successfully reconnect to the P2P
 * network via contacting one of them. So if that's the case, spend a
 * little longer trying to connect to known peers before querying the
 * DNS seeds.
 */
static constexpr std::chrono::seconds DNSSEEDS_DELAY_FEW_PEERS{11};
static constexpr std::chrono::minutes DNSSEEDS_DELAY_MANY_PEERS{5};
static constexpr int DNSSEEDS_DELAY_PEER_THRESHOLD = 1000; 
#define FEELER_SLEEP_WINDOW 1
#if !defined(MSG_NOSIGNAL)
#define MSG_NOSIGNAL 0
#endif
#if !defined(MSG_DONTWAIT)
#define MSG_DONTWAIT 0
#endif
enum BindFlags {