code impl of FieldNameConstants rewrite + test updates for it

test/transform/resource/after-ecj/FieldNameConstantsEnum.java

@@ -0,0 +1,23 @@
+import lombok.experimental.FieldNameConstants;
+import lombok.AccessLevel;
+public @FieldNameConstants(onlyExplicitlyIncluded = true,asEnum = true,innerTypeName = "TypeTest") class FieldNameConstantsEnum {
+  public @java.lang.SuppressWarnings("all") enum TypeTest {
+    iAmADvdPlayer(),
+    $dontSkipMe(),
+    alsoDontSkipMe(),
+    private @java.lang.SuppressWarnings("all") TypeTest() {
+      super();
+    }
+    <clinit>() {
+    }
+  }
+  @FieldNameConstants.Include String iAmADvdPlayer;
+  @FieldNameConstants.Include int $dontSkipMe;
+  static @FieldNameConstants.Include double alsoDontSkipMe;
+  int butSkipMe;
+  <clinit>() {
+  }
+  public FieldNameConstantsEnum() {
+    super();
+  }
+}