### 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.
OpenXRHandTrackingExtension *hand_tracking_ext = OpenXRHandTrackingExtension::get_singleton();
	if (hand_tracking_ext && hand_tracking_ext->get_active()) {
		return hand_tracking_ext->get_hand_joint_angular_velocity(OpenXRHandTrackingExtension::HandTrackedHands(p_hand), XrHandJointEXT(p_joint));
	}
	return Vector3();
}
OpenXRInterface::OpenXRInterface() {
	openxr_api = OpenXRAPI::get_singleton();
	if (openxr_api) {
		openxr_api->set_xr_interface(this);
	}
	
	_set_default_pos(head_transform, 1.0, 0);
	_set_default_pos(transform_for_view[0], 1.0, 1);
	_set_default_pos(transform_for_view[1], 1.0, 2);
	passthrough_wrapper = OpenXRFbPassthroughExtensionWrapper::get_singleton();
}
OpenXRInterface::~OpenXRInterface() {
	if (is_initialized()) {
		uninitialize();
	}
	if (openxr_api) {
		openxr_api->set_xr_interface(nullptr);
		openxr_api = nullptr;
	}
}