[REQUEST] Support for Proxy Protocol and PoW Defenses in tor-controller

[aschmeckmann]

Problem Description:
The inability to track circuit IDs and activate Proof of Work (PoW) defenses in Tor services limits traffic analysis, optimization, and protection against abuse.

Desired Solution:
Implement two settings in the onion/onionha manifest:

1. "HiddenServiceExportCircuitID haproxy" for enabling circuit ID transmission via HAProxy's Proxy Protocol.
2. "HiddenServicePoWDefensesEnabled 1" to allow activation of PoW defenses for additional security.

Additional Context:
These features will enhance both the analytical capabilities and security of high-traffic Tor services, contributing to the overall effectiveness and safety of the network.

Entry of news on the Tor blog:
https://blog.torproject.org/introducing-proof-of-work-defense-for-onion-services/

Support of the new PoW Tor feature:
https://gitlab.torproject.org/tpo/onion-services/onion-support/-/wikis/Documentation/PoW-FAQ

PoW parameter on the torrc file:
https://gitlab.torproject.org/tpo/core/tor/-/blob/main/doc/man/tor.1.txt#L3108

Export Circuit parameter on the torrc file:
https://gitlab.torproject.org/tpo/core/tor/-/blob/main/doc/man/tor.1.txt#L3509

Example of hidden service configuration:
https://gitlab.torproject.org/tpo/onion-services/onion-support/-/wikis/Documentation/PoW-FAQ#example-configuration

[aschmeckmann]

#56