j2k: flatten test cases and testData directory structure

Move j2k/test/tests -> j2k/tests, j2k/test/testData -> j2k/testData

j2k/testData/fileOrElement/annotations/annotationInterface1.java

@@ -0,0 +1,16 @@
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Target;
+
+@interface Anon {
+    String[] stringArray();
+
+    int[] intArray();
+
+    // string
+    String string();
+}
+
+@Anon(string = "a", stringArray = { "a", "b" }, intArray = { 1, 2 })
+@Target({ElementType.CONSTRUCTOR, ElementType.FIELD})
+@interface I {
+}