### 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.
Projection cm;
	ERR_FAIL_UNSIGNED_INDEX_V_MSG(p_view, get_view_count(), cm, "View index outside bounds.");
	if (openxr_api) {
		if (openxr_api->get_view_projection(p_view, p_z_near, p_z_far, cm)) {
			return cm;
		}
	}
	
	cm.set_for_hmd(p_view + 1, 1.0, 6.0, 14.5, 4.0, 1.5, p_z_near, p_z_far);
	return cm;
}
RID OpenXRInterface::get_color_texture() {
	if (openxr_api) {
		return openxr_api->get_color_texture();
	} else {
		return RID();
	}
}
RID OpenXRInterface::get_depth_texture() {
	if (openxr_api) {
		return openxr_api->get_depth_texture();
	} else {
		return RID();
	}
}
void OpenXRInterface::handle_hand_tracking(const String &p_path, OpenXRHandTrackingExtension::HandTrackedHands p_hand) {