Repro of zeth demo

[0xaatif]

• [ ] Update to latest version of zkevm in zeth (https://github.com/0xPolygonZero/zeth/issues/1)
• [ ] Manual steps which
  • Spin up a zeth node.
  • Submit a transaction.
  • Make RPC call to get trace and witness of a block
  • Successfully prove that witness with zk_evm
• [ ] Scripted steps for the above
• [ ] Prove a checked-in copy of the above witness in zkevm CI.
• [ ] Snapshot test with the above witness in zeth CI.