Better classpath intergration for maven/gradle projects

[shadycuz]

This was reported to me by a user on the groovy-guru extention here.

user wrote

I have a maven Groovy project (Jenkins shared library) and there are around 14000 files in the maven repo cache with direct and indirect dependencies of various versions of Jenkins and their plugins. It would be nice if adding every JAR file would not be required and the extension would detect maven and use its repo cache and searched it for the required JARs.

Right now I am facing many java.lang.NoClassDefFoundError or squiggly lines everywhere. All in all I think it's around 10-50 JARs, but it's cumbersome to adjust the list in extension settings as soon as a dependency tree changes versions.