Description

This PR adds the SafetensorsDataset to support interactions with tensors stored in files in the Safetensors format.

Fixes #221

Development notes

I have used the PickleDataset as a base for the implementation of this dataset (as it goes about the same manner to access files).

These changes have been tested,

1. Manually, by running the code locally to load and save tensors from and to Safetensors files.
2. Via the existing and newly added unit tests.

Checklist

• Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• Updated the documentation to reflect the code changes
• Added a description of this change in the relevant RELEASE.md file
• Added tests to cover my changes
• Received approvals from at least half of the TSC (required for adding a new, non-experimental dataset)