Fixes #7345 to add the option to minify enums (#7566)

* Added cpp minified enums

* Update generated files

* remove initializer and fix comma

* Fix .gitignore

* Fix comma

* Add tests for cpp minify enums

tests/minified_enums/enums.fbs

@@ -0,0 +1,3 @@
+enum Color : int {Red = 1, Blue, Orange}
+
+enum Size: int {Small = 10, Large = 100, Medium = 1000}

tests/minified_enums/enums_generated.h

@@ -0,0 +1,26 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+
+#ifndef FLATBUFFERS_GENERATED_ENUMS_H_
+#define FLATBUFFERS_GENERATED_ENUMS_H_
+
+#include "flatbuffers/flatbuffers.h"
+
+// Ensure the included flatbuffers.h is the same version as when this file was
+// generated, otherwise it may not be compatible.
+static_assert(FLATBUFFERS_VERSION_MAJOR == 22 &&
+              FLATBUFFERS_VERSION_MINOR == 9 &&
+              FLATBUFFERS_VERSION_REVISION == 29,
+             "Non-compatible flatbuffers version included");
+
+enum Color : int32_t {
+  Color_Red = 1,
+  Color_Blue = 2,
+  Color_Orange = 3
+};
+enum Size : int32_t {
+  Size_Small = 10,
+  Size_Large = 100,
+  Size_Medium = 1000
+};
+#endif  // FLATBUFFERS_GENERATED_ENUMS_H_