[WIP] Create script from Laplace Demo notebook for mypy testing

[NateSolon]

Description

Mypy can't test .ipynb files. I converted the Laplace Demo notebook to a script via jupyter nbconvert --to script which can be tested with mypy, similar to how is done for the other notebook examples.

How has this been tested?

I wasn't able to run the tests locally so I'm going to see if it works when I submit the PR.

Checklist

• [ x] 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
• [ x] My changes are covered by tests

[chinmayshah99]

This seems to be passing and looks good. Though a good idea would be adding mypy tests over here: https://github.com/OpenMined/PyDP/blob/dev/tests/notebooks/test_all_notebooks.py

[chinmayshah99]

357 fixes it