Pull the required data directly from object storage s3

Request

I hope to add a new function. When loki stores log data in object storage s3, if you need to pull logs from S3, it is better not to call a specific service to pull all logs through loki, but to pull the required data directly from object storage s3

The issue names no files, tests, or entry points. Start by identifying Loki’s object-storage read path and how log queries currently retrieve data through Loki, then define the required direct S3 retrieval behavior and its completion criteria before planning implementation.

Written by the indexing model from the issue text.