Move Stage 2 & 3 of Fraud Proof Verification from cosmos-sdk to Rollkit

[nashqueue]

Currently, stage 2 & 3 of Fraud Proof Verification described here live in the cosmos-sdk fraudproof prototype here.

We'd like to move these stages of verification into Rollmint instead since it takes place before a new cosmos-sdk app gets spun up by a rollmint light client which is a relatively expensive operation.

It requires some proof libraries that live in cosmos-sdk currently and we'd need to figure out a way to use the same libraries in Rollmint.