feat(anvil): add support for Isthmus hardfork (OP Stack) and make the OP spec configurable

[zerosnacks]

Component

Anvil

Describe the feature you would like

As highlighted in #10508 we currently pin to OpSpec::BEDROCK as we only really use the deposit transaction type, present in Bedrock.

foundry/crates/anvil/src/eth/backend/executor.rs

Lines 432 to 434 in a7e1bc3

	// TODO: we currently pin to `OpSpecId::BEDROCK` as it is primarily used in the context of
	// testing deposit transactions. We should make this configurable in the future.
	let op_cfg = env.evm_env.cfg_env.clone().with_spec(op_revm::OpSpecId::BEDROCK);

Upgrading this to Isthmus (latest) currently fails with: Missing operator fee scalar for isthmus L1 Block.

It looks like up to the Holocene hardfork is supported but we need to explore this further..

Additional context

Ref: #10508 (comment)

foundry/crates/anvil/src/evm.rs

Lines 224 to 231 in a7e1bc3

	#[test]
	fn build_op_evm_with_extra_precompiles_default_spec() {
	let (env, mut evm) = create_op_evm(
	SpecId::default(),
	// TODO: OpSpecId::ISTHMUS is not yet supported, fails with: `Missing operator fee
	// scalar for isthmus L1 Block`.
	OpSpecId::HOLOCENE,
	);

[zerosnacks]

Added to discuss label to indicate we didn't have a specific ask for this and we have to evaluate if there is a need / demand for it