feat(evm): use RethEvmBuilder inside ConfigureEvm (#9745)

examples/custom-evm/src/main.rs

@@ -130,6 +130,8 @@ impl ConfigureEvm for MyEvmConfig {
             .append_handler_register(inspector_handle_register)
             .build()
     }
+
+    fn default_external_context<'a>(&self) -> Self::DefaultExternalContext<'a> {}
 }
 
 /// Builds a regular ethereum block executor that uses the custom EVM.