Change proof encoding from an array of uint256 values to a bytes value

[corydickson]

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@corydickson Would you mind expanding on the benefits of this please?

[corydickson]

I believe the intention behind this issue was to discuss the gas savings of using converting some of the proof inputs that are stored in the contracts to no longer use uint256 to byte arrays. The limitations would be to be sure those conversions are handled in the toolchain when generating proofs or validating the state of the contracts.