Workaround NonClasspathClassFinder not supporting inner classes

Explicitly split qualified names, can be removed once platform is fixed

 #KT-19310 Fixed

idea/testData/script/definition/highlighting/javaNestedClass/lib/lib/JavaInterface.java

@@ -0,0 +1,13 @@
+package lib;
+
+public interface JavaInterface {
+    public interface F {
+        public interface I {
+
+        }
+    }
+
+    public class G {
+
+    }
+}