Currently in the executable model the `drools-model-compiler` has the code to generate executable model DSL under the package `org.drools.modelcompiler.builder.generator` and the interpreter that takes the DSL as the input and outputs the RETE under the `org.drools.modelcompiler` package.

These two packages can be split in two modules, i.e.

drools-executable-model-compiler
drools-executable-model-runtime

So that when having a KJAR with the DSL compiled, only the latter is needed to execute it.

Note that currently the compiler outputs the DSL based on these classes

package org.drools.modelcompiler.dsl.flow;

public class D extends FlowDSL {
}

public class D extends PatternDSL {
}

And this has to be changed, as while executing it there'll be no modelcompiler jar.

At the same time we should keep a copy of those classes in that position so that we don't loose backwards compilation