Add ratelimiting to OpWitness API

[mattsse]

Describe the feature

currently this rpc endpoint is unbounded

reth/crates/optimism/rpc/src/witness.rs

Line 54 in 1b4048e

fn execute_payload(

we should add internal ratelimiting because this is fairly expensive:

reth/crates/optimism/rpc/src/witness.rs

Line 78 in 1b4048e

struct OpDebugWitnessApiInner<Provider, EvmConfig> {

TODO

• make function async (requires adding async_trait macro for DebugExecutionWitnessApiServer) and make this async:

  reth/crates/rpc/rpc-api/src/debug.rs

  Line 404 in 1b4048e

  #[method(name = "executePayload", blocking)]

• Introduce a new tokio semaphor
• add Box<dyn TaskSpawner> to

  reth/crates/optimism/rpc/src/witness.rs

  Line 78 in 1b4048e

  struct OpDebugWitnessApiInner<Provider, EvmConfig> {

  so we can spawn as blocking
  needs update here

  reth/crates/optimism/node/src/node.rs

  Line 236 in 1b4048e

  OpDebugWitnessApi::new(ctx.node.provider().clone(), ctx.node.evm_config().clone());

Additional context

No response

[stevencartavia]

🙋🏽‍♂️