params: source chainConfig and genesis from superchain-registry

[protolambda]

Description

To make OP-Stack chain configurations available across OP-Stack client implementations, we are experimenting with a "superchain-registry": one place that hosts all superchain configurations, which can then be embedded into the software for convenience & OP-Stack wide rollout of config changes.

These config utils are optional functionality (geth init with a custom genesis setup will always work, chains can be registered after launch at any time), but aims to increase convenience of running a node.

Using the registry data, a core.Genesis can be created from the embedded block-contents and genesis-allocation. This depends on tooling to build the genesis-allocation from a list of contract-references + contract bytecode registry: we need to deduplicate the many predeploy proxies, and deduplicate contracts between OP-Stack chains, to make embedding of the genesis-data sustainable while the number of OP-Stack chains in the Superchain grows.

This also provides a new CLI option: --beta.op-network=...: to choose the network configuration. Alternative ways to configure/load a chain are still fully supported. Geth does not have a --network=name flag like many consensus-layer clients do, and adding new flags for each network is not sustainable. Thus the choice for a CLI flag that picks an OP-Stack network. This a beta feautre, and may be changed or removed at a later point, since the superchain-registry is a work-in-progress that has not been approved yet by Optimism Governance.

Note about OP-Mainnet and OP-Goerli legacy: these two networks currently rely on a datadir to run post-bedrock. Building the chain-config is useful for op-program, but the genesis is not, yet (!). With the recent introduction of snap-sync, we can re-introduce the OP-Mainnet/Goerli genesis setup, and utilize snap-sync to fetch the state (instead of requiring a datadir!) and skip pre-bedrock block verification (other than data-consistency checks like the header hash-chain).

Metadata

Fix CLI-4208

[ajsutton]

Looks good generally. I haven't looked over the super chain repo code yet but will do that next.

[trianglesphere]

Changes lgtm. The statehash thing is interesting & probably make a big difference for mainnet.