New J2K: add multi-file conversion tests from old j2k

nj2k/testData/multiFile/AnnotationWithArrayParameter/external/SomeAnnotation.java.expected

@@ -0,0 +1,8 @@
+package test;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE, ElementType.METHOD})
+public @interface SomeAnnotation {
+    String[] some() default {};
+    int[] same() default {};
+}