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See Changes: [Matthias Boehm] [SYSTEMML-2178] Update ANTLR version and include codgenalg tests [Matthias Boehm] [SYSTEMML-2179] Update janino version from 3.0.0 to 3.0.8

Re: [DISCUSS] integrated testing for MLContext, SPARK, codegen.

Hi Janardhan, in general, we prefer to compare against R because it helps detecting issues that are common across different optimizers and execution modes. So for small scripts like PCA, I would recommend to simply create an R script, which should be very similar to the dml script. However, for