added a test and handler for correctly handling confkey: lombok.delegate.flagUsage.

test/transform/resource/before/DelegateFlagUsage.java

@@ -0,0 +1,5 @@
+//conf: lombok.delegate.flagUsage = warning
+//skip compare content: We're just checking if the flagUsage key works.
+public class DelegateFlagUsage {
+	@lombok.experimental.Delegate Runnable r = null;
+}