### 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
for (int j = 0; j < argcount; j++) {
						Dictionary d3;
						d3["name"] = Variant::get_builtin_method_argument_name(type, method_name, j);
						d3["type"] = get_builtin_or_variant_type_name(Variant::get_builtin_method_argument_type(type, method_name, j));
						if (j >= (argcount - default_args.size())) {
							int dargidx = j - (argcount - default_args.size());
							d3["default_value"] = default_args[dargidx].get_construct_string();
						}
						arguments.push_back(d3);
					}
					if (arguments.size()) {
						d2["arguments"] = arguments;
					}
					methods.push_back(d2);
				}
				if (methods.size()) {
					d["methods"] = methods;
				}
			}
			{
				
				Array constructors;
				for (int j = 0; j < Variant::get_constructor_count(type); j++) {
					Dictionary d2;
					d2["index"] = j;
					Array arguments;
					int argcount = Variant::get_constructor_argument_count(type, j);
					for (int k = 0; k < argcount; k++) {
						Dictionary d3;
						d3["name"] = Variant::get_constructor_argument_name(type, j, k);