Use traces to extract the input for settlement::Observer (#3233)

# Description
Implements first part of
#3177

# Changes

- [ ] Uses `trace_transaction` function to get traces and extract the
calldata of `settle` call

## How to test
Existing tests show that no regression bugs were introduced.

Final e2e test should cover this part of the code. Although by manually
testing the `trace_transaction` I am pretty sure the code is correct.
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## Related Issues

Fixes #
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crates/autopilot/src/domain/eth/mod.rs

@@ -312,15 +312,20 @@ pub struct TradeEvent {
     pub order_uid: domain::OrderUid,
 }
 
+/// A trace of a Call type of action.
+#[derive(Debug, Clone, Default)]
+pub struct TraceCall {
+    pub to: Address,
+    pub input: Calldata,
+}
+
 /// Any type of on-chain transaction.
 #[derive(Debug, Clone, Default)]
 pub struct Transaction {
     /// The hash of the transaction.
     pub hash: TxId,
     /// The address of the sender of the transaction.
     pub from: Address,
-    /// The call data of the transaction.
-    pub input: Calldata,
     /// The block number of the block that contains the transaction.
     pub block: BlockNo,
     /// The timestamp of the block that contains the transaction.
@@ -329,4 +334,6 @@ pub struct Transaction {
     pub gas: Gas,
     /// The effective gas price of the transaction.
     pub gas_price: EffectiveGasPrice,
+    /// Traces of all Calls contained in the transaction.
+    pub trace_calls: Vec<TraceCall>,
 }