Instrument gas price simulation (#3874)

# Description

We're sometimes getting "insufficient funds" reverts with ridiculous
estimates in access lists. Adding some instrumentation that captures the
return value of the gas estimator to be able to debug this better.

Author: fafk

crates/driver/src/domain/competition/solution/settlement.rs

@@ -124,6 +124,7 @@ impl Settlement {
     }
 
     /// Create a new settlement and ensure that it is valid.
+    #[instrument(name = "create_settlement", skip_all)]
     async fn new(
         auction_id: auction::Id,
         solution: Solution,

crates/driver/src/infra/blockchain/mod.rs

@@ -13,6 +13,7 @@ use {
     },
     std::{fmt, sync::Arc, time::Duration},
     thiserror::Error,
+    tracing::{Level, instrument},
     url::Url,
     web3::{Transport, types::CallRequest},
 };
@@ -173,6 +174,7 @@ impl Ethereum {
     }
 
     /// Create access list used by a transaction.
+    #[instrument(skip_all)]
     pub async fn create_access_list<T>(&self, tx: T) -> Result<eth::AccessList, Error>
     where
         CallRequest: From<T>,
@@ -271,6 +273,7 @@ impl Ethereum {
             .map_err(Into::into)
     }
 
+    #[instrument(skip(self), ret(level = Level::DEBUG))]
     pub(super) async fn simulation_gas_price(&self) -> Option<eth::U256> {
         // Some nodes don't pick a reasonable default value when you don't specify a gas
         // price and default to 0. Additionally some sneaky tokens have special code