o5 Transport

[jmwample]

This PR is a WIP branch tracking development for the experimental o5 Transport.

Planned features:

• Ntor V3 + Extensions
• Shift from salsa20-poly1305 to chacha20poly1305 (potentially reduced round variant)
• X-Wing (X25519 + ML-KEM) KEM Handshake
• PQ-Obfs Handshake
  • "Strong Obfuscation" - an adversary with the station pubkey and Node-ID can't identify traffic see here (~10:30)
• Specification Document

Potential Changes:

• Shift from Elligator2 to RistrettoPoint
• Session Resumption
• Traffic Shaping (Padding / Delays / Cover)
• Streams (sctp / kcp / etc.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.15%. Comparing base (dbd9460) to head (c969f4f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
- Coverage   79.20%   79.15%   -0.06%     
==========================================
  Files          35       35              
  Lines        5680     5680              
  Branches     5680     5680              
==========================================
- Hits         4499     4496       -3     
- Misses        830      833       +3     
  Partials      351      351              

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