### 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.
xr_server->set_primary_interface(this);
	initialized = true;
	return initialized;
}
void OpenXRInterface::uninitialize() {
	
	
	
	free_trackers();
	free_interaction_profiles();
	free_action_sets();
	XRServer *xr_server = XRServer::get_singleton();
	if (xr_server) {
		if (head.is_valid()) {
			xr_server->remove_tracker(head);
			head.unref();
		}
	}
	initialized = false;
}
Dictionary OpenXRInterface::get_system_info() {
	Dictionary dict;
	if (openxr_api) {
		dict[SNAME("XRRuntimeName")] = openxr_api->get_runtime_name();
		dict[SNAME("XRRuntimeVersion")] = openxr_api->get_runtime_version();
	}
	return dict;
}
bool OpenXRInterface::supports_play_area_mode(XRInterface::PlayAreaMode p_mode) {