### 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.
default:
				if (!handled) {
					print_verbose(String("OpenXR Unhandled event type ") + OpenXRUtil::get_structure_type_name(runtimeEvent.type));
				}
				break;
		}
		runtimeEvent.type = XR_TYPE_EVENT_DATA_BUFFER;
		pollResult = xrPollEvent(instance, &runtimeEvent);
	}
	if (pollResult == XR_EVENT_UNAVAILABLE) {
		
		return true;
	} else {
		ERR_FAIL_V_MSG(false, "OpenXR: Failed to poll events!");
	}
}
bool OpenXRAPI::process() {
	ERR_FAIL_COND_V(instance == XR_NULL_HANDLE, false);
	if (!poll_events()) {
		return false;
	}
	if (!running) {
		return false;
	}
	for (OpenXRExtensionWrapper *wrapper : registered_extension_wrappers) {
		wrapper->on_process();
	}
	return true;
}
bool OpenXRAPI::acquire_image(OpenXRSwapChainInfo &p_swapchain) {