Dataloading utils

[daler3]

Description

Work in progress pull request for dataloading utils, dataloaders and datasets.

Affected Dependencies

Currently using PySyft 2.0. To be changed to not using PySyft at all, or eventually PySyft 3.0

How has this been tested?

Manually, unit and integration tests to be properly added

Checklist

• [ ] I have followed the Contribution Guidelines and Code of Conduct
• [ ] I have commented my code following the OpenMined Styleguide
• [ ] I have labeled this PR with the relevant Type labels
• [ ] My changes are covered by tests

[review-notebook-app[bot]]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB

[daler3]

To Resolve #81