### Godot version

4.2.dev 80de898d721f952dac0b102d48bb73d6b02ee1e8

### System information

OpenXR

### Issue description

The Godot 3 OpenXR plugin supported obtaining boundary/guardian information in order to obtain play space logic. While we do have a function in the `XRInterface` in Godot 4 that is supposed to retrieve this information (`get_play_area`) it is not implemented on the Godot 4 `OpenXRInterface`.

This logic needs to be ported.

### Steps to reproduce

Call `get_play_area`, be amazed by it not returning data :P

### Minimal reproduction project

Any XR project.
Tracker *tracker = tracker_owner.get_or_null(p_trackers[i]);
		if (tracker != nullptr && tracker->toplevel_path != XR_NULL_PATH) {
			ActionTracker action_tracker = {
				p_trackers[i], 
				XR_NULL_HANDLE, 
				false 
			};
			action.trackers.push_back(action_tracker);
			toplevel_paths.push_back(tracker->toplevel_path);
		}
	}
	XrActionCreateInfo action_info = {
		XR_TYPE_ACTION_CREATE_INFO, 
		nullptr, 
		"", 
		action.action_type, 
		uint32_t(toplevel_paths.size()), 
		toplevel_paths.ptr(), 
		"" 
	};
	copy_string_to_char_buffer(p_name, action_info.actionName, XR_MAX_ACTION_NAME_SIZE);
	copy_string_to_char_buffer(p_localized_name, action_info.localizedActionName, XR_MAX_LOCALIZED_ACTION_NAME_SIZE);
	XrResult result = xrCreateAction(action_set->handle, &action_info, &action.handle);
	if (XR_FAILED(result)) {
		print_line("OpenXR: failed to create action ", p_name, "! [", get_error_string(result), "]");
		return RID();
	}
	return action_owner.make_rid(action);
}
String OpenXRAPI::action_get_name(RID p_action) {