StreamingDataset support for older PyTorch versions

[gn-yh-lim]

Currently, StreamingDataset is incompatible with PyTorch version <2.1. Would it be possible to relax the package constraint to accommodate for torch >= 2.0.0 or even PyTorch 1.0?

The following is the error message logged with the current
ModuleNotFoundError: PyTorch version 2.1 or higher is required to use the cache.

litdata==0.2.2
pytorch_lightning==2.2.2
torch==2.1.0

[github-actions]

Hi! thanks for your contribution!, great first issue!