[OTHER] Add cucumber-style BDD testing

[tommens]

Explain the issue you would like to report

• Add support for Cucumber BDD scenarios, on top of the Junit platform. If you are not familiar with Cucumber and BDD (Behaviour-Driven Development), please refer to https://cucumber.io/docs/cucumber/.
• Provide several examples of scenarios that can be automatically tested in this way.
• Ensure that all BDD tests are automatically tested with Maven and with the GitHub workflow.