[UtilityClass] [issue #2384] Added a test to confirm no issue.

added some tests to confirm that lombok makes things static if needed.

test/transform/resource/before/UtilityClassInner.java

@@ -0,0 +1,4 @@
+class UtilityClassInner {
+	@lombok.experimental.UtilityClass
+	class UtilClass {}
+}