Add JUnit 5 unit tests for Constants class and configure Maven test support (fixes #162) #169
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Adding a comprehensive JUnit 5 test class (ConstantsTest.java) for the Constants class, covering all public constants and enforcing non-instantiability.
Ensuring Maven is configured for JUnit 5, enabling future test development and execution.
Establishing a foundation for improved test coverage and code quality in Project-16x16.