### 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.
return initialized;
};
bool OpenXRInterface::initialize() {
	XRServer *xr_server = XRServer::get_singleton();
	ERR_FAIL_NULL_V(xr_server, false);
	if (openxr_api == nullptr) {
		return false;
	} else if (!openxr_api->is_initialized()) {
		return false;
	} else if (initialized) {
		return true;
	}
	
	_load_action_map();
	if (!openxr_api->initialize_session()) {
		return false;
	}
	
	head.instantiate();
	head->set_tracker_type(XRServer::TRACKER_HEAD);
	head->set_tracker_name("head");
	head->set_tracker_desc("Players head");
	xr_server->add_tracker(head);
	
	Vector<RID> loaded_action_sets;
	for (int i = 0; i < action_sets.size(); i++) {
		loaded_action_sets.append(action_sets[i]->action_set_rid);
	}
	openxr_api->attach_action_sets(loaded_action_sets);