[WIP] Refactor 860

[victorperezc]

Description

Closes #860

How has this been tested?

• Locally

Checklist

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

[IonesioJunior]

PyGrid has been moved to PySyft repository.