### 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.
#ifndef OPENXR_INTERFACE_H
#define OPENXR_INTERFACE_H
#include "action_map/openxr_action_map.h"
#include "extensions/openxr_fb_passthrough_extension_wrapper.h"
#include "extensions/openxr_hand_tracking_extension.h"
#include "openxr_api.h"
#include "servers/xr/xr_interface.h"
#include "servers/xr/xr_positional_tracker.h"
#define INTERACTION_PROFILE_NONE "/interaction_profiles/none"
class OpenXRInterface : public XRInterface {