Feature: MergeJars could merge files from META-INF\versions to create smaller jars

[joerg1985]

When passing a minimum Java to the MergeJars, files from META-INF/versions could by applied to the codebase, for all lower versions.
This would reduce the size of the jar, as the old .class files would be removed from the jar.

e.g. the selenium-server-4.26.0.jar does ship 4.5 MB (~10% of its size) inside the META-INF/versions/9. The minimum version to run the server is 11, so all these files could be moved to the regular code base.