Create a new supervised discretizer

[MarvinGronhorst]

Since we did not find a non-GPL CRAN-hosted package, that discretizes continuous data in a supervised manner #44 , a supervised discretizer should be implemented directly. It could resemble the implementations of viadee in the 'javaAnchorAdapters' package. https://github.com/viadee/javaAnchorAdapters/tree/master/DefaultConfigsExtension/src/main/java/de/viadee/xai/anchor/adapter/tabular/discretizer/impl

Useful discretizers could be FUSINTER (FUSINTERDiscretizer.java) see: FUSINTER_A_Method_for_Discretization_of_Continuous.pdf

or Ameva (AmevaDiscretizer.java) see: AMEVA 2009-Gonzalez-Abril-ESWA.pdf

or another discretizer, as supervised discretizations are currently being implemented and evaluated for the Java implementation of Anchors.

These should discretize as shown in the tests:

https://github.com/viadee/javaAnchorAdapters/tree/master/DefaultConfigsExtension/src/test/java/de/viadee/xai/anchor/adapter/tabular/discretizer/impl