data diffusion startup in cardano-node

[coot]

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Currently the flow of data in cardano-node is not very clear. Partially the confusion comes from the fact that runDataDiffusion is run by consensus application. The current flow is:

environment (genesis, config, cli options) → consensus protocol setup → consensus options & network options → consensus starts data diffusion

Some network options go into consensus like network magic (it's needed to start protocols), some not (node addresses for diffusion). We should have something like this:

runDataDiffusion
  ∷ DiffusionArguments
  → (NetworkArgumentsRequiredByConsensus → m NodeToNodeProtocols)
  → m Void

NetworkArgumentsRequiredByConsensus would be passed as part of DiffusionArguments and they can come from environment (genesis, CLI args, etc), without going through consensus setup first (the protocolInfo and friends).