* BAEL-5692 Validate UUID String in Java
* cleaned up the Main method
* added unit test for uuid validation
* renamed unit test method name
* formatted unit test
* removed unneeded file
* replaced gradle by maven
* removed gradle project
* moved project
* added readme file
* segregated unit tests by validator type.
* inlined the validating logic inside the unit tests
* moved the UUIDValidatorTest.java to core-java-uuid module
* renamed test
Co-authored-by: andrei-mandris <andrei.mandris.ext@deliveryhero.com>
