- Added helper convenience functions to get S3 path from database
> Not sure if they should return `Result<Option>` rather than raw `Result`
- Copied constants from [C++ service](https://github.com/CommE2E/comm/blob/de3b477b669f67ac685f6787606f73557f9d9ac2/services/lib/src/GlobalConstants.h#L8-L21) with comments
Depends on D5694