feat: Better progress reporting for stage checkpoints (#2982)

Co-authored-by: Alexey Shekhirin <a.shekhirin@gmail.com>

crates/storage/codecs/derive/src/compact/structs.rs

@@ -119,7 +119,13 @@ impl<'a> StructHandler<'a> {
         assert!(
             known_types.contains(&ftype.as_str()) ||
                 is_flag_type(ftype) ||
-                self.fields_iterator.peek().is_none(),
+                self.fields_iterator.peek().map_or(true, |ftypes| {
+                    if let FieldTypes::StructField((_, ftype, _, _)) = ftypes {
+                        !known_types.contains(&ftype.as_str())
+                    } else {
+                        false
+                    }
+                }),
             "`{ftype}` field should be placed as the last one since it's not known. 
             If it's an alias type (which are not supported by proc_macro), be sure to add it to either `known_types` or `get_bit_size` lists in the derive crate."
         );