feat: implement CIP22 #15
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CIP22 changes the contents of the EpochSnarkData field in a few ways: Pads the validator set to some fixed size Moves data from the inner hash to the outer one to enable efficient slashing Adds randomness to prevent the "future subcommittee attack" For more details, see CIP-22. This depends on changes in celo-bls-go: celo-org/celo-bls-go#15. The changes are activated after the Donut fork block number. Co-authored-by: lucasege <lucas@celo.org>
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This implements the CIP22 changes, as described in https://github.com/celo-org/celo-proposals/blob/master/CIPs/0022.md and implemented in celo-org/celo-bls-snark-rs#194 and celo-org/celo-bls-snark-rs#195.
Almost 100% based on the work done by @lucasege and @nategraf.