* [JAVA-5730] convert list of objects to list of strings
* [JAVA-5730] added new unit tests with null and non-null lists. modified pom.xml with java version to 16
* [JAVA-5730] simplified User class and formatted the codebase
* [JAVA-5730] added module in jdk-9 and above profile
* [JAVA-5730] removed arraylist module from other profiles of core-java pom
* [JAVA-5730] java util opened for reflection surefire plugin
Co-authored-by: Bhaskar <bhaskar.dastidar@freshworks.com>
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