feat(evm): driver skeleton, StateDelta, keys and EIP-712

[atharrva01]

Second part of the EVM driver, on top of #1850.

This adds the driver skeleton and the core data model. The driver registers and routes fine, but the methods are still no-ops on purpose. The goal here is just to lock down the shapes everything else builds on before I start on the contracts and the translator.

What's in it:

• a no-op driver.Network with the EVMClient interface, and the evmdlog SDK module that wires it in
• the StateDelta and the bytes32 key derivations. For graph-revealing spends the reference binds the token content (OutputSNMarker), same idea as Fabric's CreateOutputSNKey. Without it a stateless validator would let someone present forged bytes at a real (txid, index)
• the EIP-712 domain, hashStruct and digest for the StateDelta, cross-checked against ethers so we know it matches what a wallet would sign

No contracts, translator, signer, endorsement or finality yet, those come in follow-ups.

Stacked on #1850, so the two commits to look at are the top ones. go-ethereum stays out, with a build guard to keep it that way.