### 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
while (true) {
				Variant::Type t = member_offset_array[idx].type;
				if (t != previous_type) {
					if (previous_type != Variant::NIL) {
						d2["members"] = members;
						type_offsets.push_back(d2);
					}
					if (t == Variant::NIL) {
						break;
					}
					String name = t == Variant::VARIANT_MAX ? String("Variant") : Variant::get_type_name(t);
					d2 = Dictionary();
					members = Array();
					offset = 0;
					d2["name"] = name;
					previous_type = t;
				}
				Dictionary d3;
				const char *member_meta = nullptr;
				uint32_t member_size = 0;
				switch (i) {
					case 0:
						member_meta = member_offset_array[idx].member_meta_32_bits_real_float;
						member_size = member_offset_array[idx].member_size_32_bits_real_float;
						break;
					case 1:
						member_meta = member_offset_array[idx].member_meta_64_bits_real_float;
						member_size = member_offset_array[idx].member_size_64_bits_real_float;
						break;
					case 2: