### 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.
} else {
			action->action_name = p_action_name;
		}
	} else {
		action->action_name = p_action_name;
	}
	action->action_type = p_action_type;
	action->action_rid = openxr_api->action_create(p_action_set->action_set_rid, p_action_name, p_localized_name, p_action_type, tracker_rids);
	p_action_set->actions.push_back(action);
	
	for (int i = 0; i < p_trackers.size(); i++) {
		if (p_trackers[i]->actions.find(action) == -1) {
			p_trackers[i]->actions.push_back(action);
		}
	}
	return action;
}
OpenXRInterface::Action *OpenXRInterface::find_action(const String &p_action_name) {
	
	for (int i = 0; i < action_sets.size(); i++) {
		for (int j = 0; j < action_sets[i]->actions.size(); j++) {
			if (action_sets[i]->actions[j]->action_name == p_action_name) {
				return action_sets[i]->actions[j];
			}
		}
	}
	
	return nullptr;
}
void OpenXRInterface::free_actions(ActionSet *p_action_set) {