idea: Move root out of backend to operator instead

[Xuanwo]

Every services need to handle root, which most of the time is duplicated. Maybe we can move root of backend and handling at operato level?

Benefits:

• Operator can implement something like cd/change_root so users don't need to build a new one.
• Services don't need to handle root logic again and again.

Most services should work smoothly, but we need to handle Windows paths carefully, as they will require a format like C:\\path\\to\\data.

[yuchanns]

IMO it is better to build an absolute path at the operator level and pass it to the service backends. It delivers a clear path which may reduce path-related bugs when implementing a backend.

[Xuanwo]

IMO it is better to build an absolute path at the operator level and pass it to the service backends. It delivers a clear path which may reduce path-related bugs when implementing a backend.

That's exactly what this idea want to address