### 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
d2["type"] = get_property_info_type_name(F);
					d2["name"] = String(property_name);
					StringName setter = ClassDB::get_property_setter(class_name, F.name);
					if (!(setter == "")) {
						d2["setter"] = setter;
					}
					StringName getter = ClassDB::get_property_getter(class_name, F.name);
					if (!(getter == "")) {
						d2["getter"] = getter;
					}
					int index = ClassDB::get_property_index(class_name, F.name);
					if (index != -1) {
						d2["index"] = index;
					}
					properties.push_back(d2);
				}
				if (properties.size()) {
					d["properties"] = properties;
				}
			}
			classes.push_back(d);
		}
		api_dump["classes"] = classes;
	}
	{
		
		Array singletons;
		List<Engine::Singleton> singleton_list;
		Engine::get_singleton()->get_singletons(&singleton_list);
		for (const Engine::Singleton &s : singleton_list) {