Dopant prediction module and test suite updates

What's Changed

• Dopant prediction by @JiwooChloeLee in #59
• fix tests and move to GitHub Actions by @dandavies99 in #60
• update setup.py and README by @AntObi in #62

New Contributors

• @JiwooChloeLee made their first contribution in #59

Full Changelog: v2.3.3.1...v2.4.0