test: add a proto-ledger simulating roll forwards and backwards

[etorreborre]

WIP!!!

The purpose of this PR is to run the simulator with a very simple model of the ledger.
This would fail all the time at the moment given the fact that we roll forward every single block we receive, instead of only changing the ledger state once we know what's the best new tip.

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✨ Finishing touches

🧪 Generate unit tests (beta)

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• Commit unit tests in branch etorreborre/test/model-ledger-in-simulation-tests

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