KnowledgeBuilderImpl is (one of) the class(es) that perform the build procedure of the Drools engine. It is a facade for multiple concerns (package handling, resource handling, compilation, ...)

The goal of this PR is to continue the work started with DROOLS-6854 (https://github.com/kiegroup/drools/pull/4229), further breaking down KnowledgeBuilderImpl into reusable components.

This way, the phases defined in DROOLS-6854 can be instantiated without depending on the heavy-weight KnowledgeBuilderImpl