fix: add eth_utils mod.rs to register failover_middleware

Co-Authored-By: Jayant Krishnamurthy <[email protected]>

Author: devin-ai-integration[bot]

apps/fortuna/src/eth_utils/mod.rs

@@ -0,0 +1,6 @@
+pub mod eth_gas_oracle;
+pub mod failover_middleware;
+pub mod legacy_tx_middleware;
+pub mod nonce_manager;
+pub mod traced_client;
+pub mod utils;