### 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.
for (ActionSet *action_set : action_sets) {
		if (action_set->action_set_name == p_action_set) {
			action_set->is_active = p_active;
			return;
		}
	}
	WARN_PRINT("OpenXR: Unknown action set " + p_action_set);
}
Array OpenXRInterface::get_action_sets() const {
	Array arr;
	for (ActionSet *action_set : action_sets) {
		arr.push_back(action_set->action_set_name);
	}
	return arr;
}
double OpenXRInterface::get_render_target_size_multiplier() const {
	if (openxr_api == nullptr) {
		return 1.0;
	} else {
		return openxr_api->get_render_target_size_multiplier();
	}
}
void OpenXRInterface::set_render_target_size_multiplier(double multiplier) {
	if (openxr_api == nullptr) {
		return;
	} else {
		openxr_api->set_render_target_size_multiplier(multiplier);
	}
}
bool OpenXRInterface::is_foveation_supported() const {