### 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.
ERR_FAIL_NULL(openxr_api);
	Action *action = find_action(p_action_name);
	ERR_FAIL_NULL(action);
	
	String tracker_name = p_tracker_name;
	if (tracker_name == "left_hand") {
		tracker_name = "/user/hand/left";
	} else if (tracker_name == "right_hand") {
		tracker_name = "/user/hand/right";
	}
	Tracker *tracker = find_tracker(tracker_name);
	ERR_FAIL_NULL(tracker);
	
	XrDuration duration = XrDuration(p_duration_sec * 1000000000.0); 
	openxr_api->trigger_haptic_pulse(action->action_rid, tracker->tracker_rid, p_frequency, p_amplitude, duration);
}
void OpenXRInterface::free_trackers() {