Initial Monte-Carlo analysis integration

[martin-springer]

Describe your changes

Added a new package that allows to perform Monte-Carlo analysis.

Type of change

• [x] New feature (non-breaking change which adds functionality)

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] Code changes are covered by tests.
• [x] Code changes have been evaluated for compatibility/integration with Scenario analysis (for future PRs)
• [x] New functions added to init.py
• [x] API.rst is up to date, along with other sphinx docs pages
• [x] Example notebooks are rerun and differences in results scrutinized
• [x] What's new changelog has been updated in the docs