Enhancement: Optimize S3 subfolder scanning in date range

[coderabbitai]

The TODO comment in the PR suggests enhancing the functionality to scan subfolders in a date range without reading the entire folder. This is currently not implemented and needs to be addressed for better performance and efficiency.\n\nPR URL: https://github.com/zipline-ai/chronon/pull/12\nComment URL: https://github.com/zipline-ai/chronon/pull/12#discussion_r1718802833\n\n@nikhil-zlai