### 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.
XrResult result = xrAttachSessionActionSets(session, &attach_info);
	if (XR_FAILED(result)) {
		print_line("OpenXR: failed to attach action sets! [", get_error_string(result), "]");
		return false;
	}
	for (int i = 0; i < p_action_sets.size(); i++) {
		ActionSet *action_set = action_set_owner.get_or_null(p_action_sets[i]);
		ERR_FAIL_NULL_V(action_set, false);
		action_set->is_attached = true;
	}
	/* For debugging:
	print_verbose("Attached set " + action_set->name);
	List<RID> action_rids;
	action_owner.get_owned_list(&action_rids);
	for (int i = 0; i < action_rids.size(); i++) {
		Action * action = action_owner.get_or_null(action_rids[i]);
		if (action && action->action_set_rid == p_action_set) {
			print_verbose(" - Action " + action->name + ": " + OpenXRUtil::get_action_type_name(action->action_type));
			for (int j = 0; j < action->trackers.size(); j++) {
				Tracker * tracker = tracker_owner.get_or_null(action->trackers[j].tracker_rid);
				if (tracker) {
					print_verbose("    - " + tracker->name);
				}
			}
		}
	}
	*/
	return true;
}
void OpenXRAPI::action_set_free(RID p_action_set) {