BEEFY: Replace barretenberg with SP1 #319
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Replace Barretenberg with SP1 proofs. Barretenberg is a circuit-DSL, which unfortunately means that the size of the circuit inputs cannot change, which can lead to bricked light clients on the mainnet.
SP1 is production-ready and supports CUDA and dynamic inputs because it is a zkVM. This is critical because Polkadot can dynamically grow its validator size, increasing the size of the BEEFY commitment as a result.
This PR adds the sp1 verifier contracts, ABI conversions, and some extra utilities to the beefy-prover.