### Godot version

4.0beta12

### System information

all

### Issue description

In `extension_api.json` we have some function that uses parameter typed after a global enum and display it as a bitfield:
```js
{
	"name": "set_button_mask",
	"is_const": false,
	"is_vararg": false,
	"is_static": false,
	"is_virtual": false,
	"hash": 3950145251,
	"arguments": [
		{
			"name": "mask",
			"type": "bitfield::MouseButtonMask" // bitfield prefix here !
		}
	]
},
```

However the global enum's own definition doesn't mention it is a bitfield:
```js
{
	"name": "MouseButtonMask",
	// No "bitfield" field here !
	"values": [
		{
			"name": "MOUSE_BUTTON_MASK_LEFT",
			"value": 1
		},
		{
			"name": "MOUSE_BUTTON_MASK_RIGHT",
			"value": 2
		},
		{
			"name": "MOUSE_BUTTON_MASK_MIDDLE",
			"value": 4
		},
		{
			"name": "MOUSE_BUTTON_MASK_MB_XBUTTON1",
			"value": 128
		},
		{
			"name": "MOUSE_BUTTON_MASK_MB_XBUTTON2",
			"value": 256
		}
	]
},
```

On the other hand, the non-global enums (i.e. the ones defined as part of a class) have this `is_bitfield` field.
So I guess we should add it to global enum too.

### Steps to reproduce

n/a

### Minimal reproduction project

n/a
member_type,                                                      \
				sizeof(double) * member_elems,                                    \
	}
		struct {
			Variant::Type type;
			const char *member;
			const char *member_meta_32_bits_real_float;
			const uint32_t member_size_32_bits_real_float;
			const char *member_meta_64_bits_real_float;
			const uint32_t member_size_64_bits_real_float;
			const char *member_meta_32_bits_real_double;
			const uint32_t member_size_32_bits_real_double;
			const char *member_meta_64_bits_real_double;
			const uint32_t member_size_64_bits_real_double;
		} member_offset_array[] = {
			
			REAL_MEMBER_OFFSET(Variant::VECTOR2, "x"),
			REAL_MEMBER_OFFSET(Variant::VECTOR2, "y"),
			
			INT32_MEMBER_OFFSET(Variant::VECTOR2I, "x"),
			INT32_MEMBER_OFFSET(Variant::VECTOR2I, "y"),
			
			REAL_BASED_BUILTIN_MEMBER_OFFSET(Variant::RECT2, "position", "Vector2", 2),
			REAL_BASED_BUILTIN_MEMBER_OFFSET(Variant::RECT2, "size", "Vector2", 2),
			
			INT32_BASED_BUILTIN_MEMBER_OFFSET(Variant::RECT2I, "position", "Vector2i", 2),
			INT32_BASED_BUILTIN_MEMBER_OFFSET(Variant::RECT2I, "size", "Vector2i", 2),
			
			REAL_MEMBER_OFFSET(Variant::VECTOR3, "x"),
			REAL_MEMBER_OFFSET(Variant::VECTOR3, "y"),