Scoru,Proto: refutation storage is already carbonated

Context

I feel like this storage module is already carbonated. I don't think there any much logic than calls to the storage which are already carbonated. The most expensive thing I can see that is not carbonated would be the normalization of indexes, which I would like to improve in #3099 (closed) among other optimizations about stakers

As discussed with @thomas.athorne, one main thing that will need carbonation is the proof verification. Thus, we move the scope of #2759 (closed) to carbonate the refutation game instead (which is called by this module).

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