security/snowflake-tor: update 2.1.0 to 2.3.0

• while here,
  • add 'broker' support;
  • add 'tor' as RUN_DEPENDS, as broker uses its geoip databases;
  • add rc script to start a local broker without TLS support.
    
    Changes in version v2.3.0
• Issue 40146: Avoid performing two NAT probe tests at startup
• Issue 40134: Log messages from client NAT check failures are confuse
• Issue 34075: Implement metrics to measure snowflake churn
• Issue 28651: Prepare all pieces of the pipeline for a second bridge
• Issue 40129: Distributed Snowflake Server Support
  
  Changes in version v2.2.0
• Issue 40099: Initialize SnowflakeListener.closed
• Add connection failure events for proxy timeouts
• Issue 40103: Fix proxy logging verb tense
• Fix up and downstream metrics output for proxy
• Issue 40095: uTLS for broker negotiation
• Forward bridge fingerprint from client to broker (WIP, Issue 28651)
• Issue 40104: Make it easier to configure proxy type
• Remove version from ClientPollRequest
• Issue 40124: Move tor-specific code out of library
• Issue 40115: Scrub pt event logs
• Issue 40127: Bump webrtc and dtls library versions
• Bump version of webrtc and dtls to fix dtls CVEs
• Issue 40141: Ensure library calls of events can be scrubbed

Sponsored by: TorBSD Diversity Project (TDP)
Sponsored by: The Tor Project