Denial Constraints

[clarapueyoballarin]

Added new .dml script for denial constrains calculation
Added its implementation for the builtins

[Shafaq-Siddiqi]

Hi,
Thank you for your contribution. Please add the tests in our test suite for your built-in. For the DML scripts, we use two-space indentation. If you are still working on the project please mark it as "WIP".

[corepointer]

• Thanks for the PR, already looks promising. Some code to test it, as @Shafaq-Siddiqi already said, would be very appreciated :) Have a look at other builtins test functions do it and create a test class like the ones in src/test/java/org/apache/sysds/test/functions/builtin/*
• In addition to the indentation, some variables could have a more descriptive name.
• Please correct constrains to constraints.

[Shafaq-Siddiqi]

LGTM,
Thank you @clarapueyoballarin for your contribution. During the merge, I have fixed some minor formatting, warnings, and header of the DML script.