Implement usage of compiled artifact inside runtime

Currently new KiePMMLRuntime use class/instances created by the compiler "on the fly".
But in the final situation such classes may be created during "kjar" creation, and so they have to be put inside runtime' classpath.

This task includes
1) modification of kie-maven-plugin
2) modification/verification of KiePMMLModel creation
3) modification/verification of KiePMMLModel usage