Proposal to stop checking chain-id

[k06a]

EIP712 implementations already taking care of this check, but a bit differently:

• Current behavior: always revert on forked chain
• Solady/OZ behavior: dynamically use actual chain-id on forked chain

EIP712 implementations:

• Solady/EIP712.sol#L130
• OpenZeppelin/EIP712.sol#L81