treewide: enforce strict clippy check

fix/benches/utils.rs

@@ -1,4 +1,5 @@
-#![allow(dead_code)]
+#![allow(clippy::allow_attributes_without_reason)]
+#![allow(dead_code, clippy::unwrap_used, clippy::unwrap_in_result)]
 
 use fix::Evaluator;
 use fix_error::{Result, Source};