* [JAVA-1657] core-java-modules JUnit and Maven Surefire Plugin upgrade
* [JAVA-1657] Changed sub modules parents to core-java-modules and core-java-modules to parent-java
* [JAVA-1657] Upgraded JUnit Jupiter version
* [JAVA-1657] Get JUnit 4 dependency transitively
* Delete core-java-lang-oop module (remaining code
was duplicate of core-java-lang-syntax where it really belonged)
* Moved code from https://www.baeldung.com/java-eclipse-equals-and-hashcode to core-java-lang where it belong
* Delete core-java-lang-oop-2 module
* Delete core-java-lang-oop-3 module
* Delete core-java-lang-oop-4 module