Starknet Consensus analysis

[stranger80]

• Analyze proposals for Starknet's consensus: https://community.starknet.io/t/simple-decentralized-protocol-proposal/99693/11
• Analyze proposed enhancements of Tendermint protocol: https://community.starknet.io/t/tendermint-for-starknet/98248
• Compare against vanilla Tendermint: https://arxiv.org/abs/1807.04938