Add `junit-jupiter-params` for Groovy

[hobovsky]

Please complete the following information about the package:

• Package name: org.junit.jupiter:junit-jupiter-params
• Language name: Groovy
• Website: Maven repo, JUnit manual

Following are optional, but will help us consider adding:

• Why is this useful? It allows parametrized tests like Java kata currently do.

Related: #303

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:+1: reaction might help to get this request prioritized.