Add integration test demonstrating how to use a JNI NAR from a JAR

Like `it0004-java-dep-jni`, this test depends on `it0003-jni`; however, this test uses JAR packaging instead of NAR. `it0004` is left unchanged as it is also a JNI project that includes native code.

    $ mvn -Prun-its
    ...
    [INFO] Building: it0025-jar-dep-jni\pom.xml
    [INFO] ..SUCCESS (5.4 s)
    [INFO] -------------------------------------------------
    [INFO] Build Summary:
    [INFO]   Passed: 21, Failed: 0, Errors: 0, Skipped: 0
    [INFO] -------------------------------------------------