Use logger to add debug mode

When in debug mode,
- print the filename being saved in the `save_json` function
- print the filename being opened in `load_json` function.
- do whatever `verbose=True` does in the `search_object` function

When `load_database` or `save_database` fails, this would help troubleshoot the file that is causing the problem.

首先阅读 save_json、load_json、search_object、load_database 和 save_database 函数，以了解现有的详细行为和失败路径。为保存和打开的文件名添加调试日志，并使调试模式包含 search_object 中由 verbose=True 提供的行为；当数据库失败能够显示相关文件名时，即视为完成。

由索引模型根据 Issue 内容生成。