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Refactor the logic for constructing crypt layers.

Nick Mathewson requested to merge nickm/arti:refactor_stream_crypto_init into main

The key insights here are:

  • That relay cell format and crypto protocols aren't orthogonal: Once we have GCO, it will require V1.
  • That we only need the actual functions for layer construction to be generic; we don't need to proliferate generic parameters everywhere.
  • That the circuit::handshake module already does most of what we want.

@jnewsome, this is the refactoring I had in mind based on !2045 (merged). What do you think?

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