AutoX_Recommend, Item特征

代码结构可以参考:
https://github.com/4paradigm/AutoX/blob/master/autox/autox_recommend/recall_and_rank/feature_engineer/user_feature_engineer.py

The issue references a user feature engineering file in the recall_and_rank module. Start by examining the linked file to understand the existing feature engineering pattern. Then, determine what 'Item特征' (item features) should be added and where they fit in the AutoX_recommend pipeline. Check for tests or examples of feature engineering in the repository to see the expected output format.

索引モデルが issue の本文から書いたものです。