### 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
d3["type"] = get_builtin_or_variant_type_name(Variant::get_constructor_argument_type(type, j, k));
						arguments.push_back(d3);
					}
					if (arguments.size()) {
						d2["arguments"] = arguments;
					}
					constructors.push_back(d2);
				}
				if (constructors.size()) {
					d["constructors"] = constructors;
				}
			}
			{
				
				d["has_destructor"] = Variant::has_destructor(type);
			}
			builtins.push_back(d);
		}
		api_dump["builtin_classes"] = builtins;
	}
	{
		
		Array classes;
		List<StringName> class_list;
		ClassDB::get_class_list(&class_list);
		class_list.sort_custom<StringName::AlphCompare>();
		for (const StringName &class_name : class_list) {
			Dictionary d;
			d["name"] = String(class_name);
			d["is_refcounted"] = ClassDB::is_parent_class(class_name, "RefCounted");