Review ERC-7785 and Align OPCM Implementation

[tynes]

This ticket is a follow up from Ethereum Interop Forum. ERC-7785 is a proposed standard meant to make progress on putting L2 chain configs on L1. One part of this is to have a standard way to compute chain IDs between ecosystems. We should review ERC-7785 and see if it fits in well with the OP Contracts Manager. We should propose any modifications to ERC-7785 and adopt them into OPCM. The spec for OPCM can be found here.