Question on op-deployer: Why is ID a hash in ChainState

Hey team,

At the time of writing this, in `op-deployer`, it would seem that `ChainState.ID` is of type `common.Hash`. found [here](https://github.com/ethereum-optimism/optimism/blob/b6a82c2de9c9372d3012e73e702e9671579425b7/op-deployer/pkg/deployer/state/state.go#L94)

additionally, that gets compared via `==` in the `Chain` function [here](https://github.com/ethereum-optimism/optimism/blob/b6a82c2de9c9372d3012e73e702e9671579425b7/op-deployer/pkg/deployer/state/state.go#L78)

so, a few questions arise:
* is that supposed to be the chain id? wouldn't it be more appropriate to have it as an integer type (such as `uint64` or `big.Int`)? or am I missing something? 🤔
* if the id should be a hash, should that comparison be using [Hash.Cmp](https://pkg.go.dev/github.com/ethereum/go-ethereum/common#Hash.Cmp) ?

Thanks for your help in advance.

Start with op-deployer/pkg/deployer/state/state.go, especially ChainState.ID and the Chain function, then trace where the ID is populated and used. Determine whether it represents a chain ID or a hash and document the intended comparison or required change; done means the semantics and any follow-up are clear.

Written by the indexing model from the issue text.