Generate a C++ function for EnumValues{{ENUM_NAME}} (#4337)

* enables "for each" logic on enumeration types

tests/monster_test_generated.h

@@ -39,6 +39,15 @@ enum Color {
   Color_ANY = 11
 };
 
+inline Color (&EnumValuesColor())[3] {
+  static Color values[] = {
+    Color_Red,
+    Color_Green,
+    Color_Blue
+  };
+  return values;
+}
+
 inline const char **EnumNamesColor() {
   static const char *names[] = {
     "Red",
@@ -68,6 +77,16 @@ enum Any {
   Any_MAX = Any_MyGame_Example2_Monster
 };
 
+inline Any (&EnumValuesAny())[4] {
+  static Any values[] = {
+    Any_NONE,
+    Any_Monster,
+    Any_TestSimpleTableWithEnum,
+    Any_MyGame_Example2_Monster
+  };
+  return values;
+}
+
 inline const char **EnumNamesAny() {
   static const char *names[] = {
     "NONE",