Feature/migrate to jest

[yannbf]

Issue: N/A

Mocha was super annoying with Typescript, was not watching files etc.

Checklist

Check the ones applicable to your change:

• [ ] Ran yarn update-all
• [ ] Tests are updated
• [ ] Documentation is updated

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• [x] maintenance
• [ ] documentation
• [ ] patch
• [ ] minor
• [ ] major

[yannbf]

self merging @shilman

[github-actions[bot]]

:rocket: PR was released in v0.3.0 :rocket: