laanwj b639417b39 net: Add Tor extended SOCKS5 error codes
Add support for reporting Tor extended SOCKS5 error codes as defined
here:

- https://spec.torproject.org/socks-extensions.html#extended-error-codes
- https://gitlab.torproject.org/tpo/core/arti/-/blob/main/crates/tor-socksproto/src/msg.rs?ref_type=heads#L183

These give a more direct indication of the problem in case of errors
connecting to hidden services, for example:
```
2025-04-02T10:34:13Z [net] Socks5() connect to [elided].onion:8333 failed: onion service descriptor can not be found
```

In the C Tor implementation, to get these one should set the
"ExtendedErrors" flag on the "SocksPort" definition, introduced in
version 0.4.3.1.

In Arti, extended error codes are always enabled.

Also, report the raw error code in case of unknown reply values.
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