chore(anvil): use cfg(feature = "cmd") instead of allow(dead_code) for parse (#12425)

Author: Fallengirl

crates/anvil/src/eth/backend/db.rs

@@ -514,7 +514,7 @@ impl SerializableState {
     }
 
     /// This is used as the clap `value_parser` implementation
-    #[allow(dead_code)]
+    #[cfg(feature = "cmd")]
     pub(crate) fn parse(path: &str) -> Result<Self, String> {
         Self::load(path).map_err(|err| err.to_string())
     }