### 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.
uint64_t size = uint64_t(action->trackers.size());
	for (uint64_t i = 0; i < size && index == 0xFFFFFFFF; i++) {
		if (action->trackers[i].tracker_rid == p_tracker) {
			index = i;
		}
	}
	if (index == 0xFFFFFFFF) {
		
		return XRPose::XR_TRACKING_CONFIDENCE_NONE;
	}
	XrTime display_time = get_next_frame_time();
	if (display_time == 0) {
		return XRPose::XR_TRACKING_CONFIDENCE_NONE;
	}
	if (action->trackers[index].space == XR_NULL_HANDLE) {
		
		XrActionSpaceCreateInfo action_space_info = {
			XR_TYPE_ACTION_SPACE_CREATE_INFO, 
			nullptr, 
			action->handle, 
			tracker->toplevel_path, 
			{
					{ 0.0, 0.0, 0.0, 1.0 }, 
					{ 0.0, 0.0, 0.0 } 
			} 
		};
		XrSpace space;
		XrResult result = xrCreateActionSpace(session, &action_space_info, &space);
		if (XR_FAILED(result)) {
			print_line("OpenXR: couldn't create action space! [", get_error_string(result), "]");