feat(`anvil`): make the OP spec configurable

[zerosnacks]

Component

Anvil

Describe the feature you would like

As highlighted in #10508 we currently pin to OpSpec::ISTHMUS per #10567 (OpSpec::BEDROCK prior)

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

Line 434 in 0afc4c4

let op_cfg = env.evm_env.cfg_env.clone().with_spec(op_revm::OpSpecId::ISTHMUS);

Ideally this would be configurable in some manner to support all Optimism hardforks prior

[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

[zerosnacks]

Hey @mds1, would making the OP spec in Anvil be of use / beneficial to Optimism?