Add test code coverage reporting to IDE and build

• Information on how to do this: http://codeandme.blogspot.com/2020/11/add-code-coverage-reports-to-eclipse.html
• Example usage from Eclipse CommaSuite: https://gitlab.eclipse.org/eclipse/comma/comma/-/blob/969835ddfdde4fd6b4775e6e3d165069ee0751be/pom.xml#L340