Function startLayoutShiftTracking

startLayoutShiftTracking(opts?: LayoutShiftOptions): () => void
Starts tracking Cumulative Layout Shift (CLS) for the current page.
Parameters
- opts: LayoutShiftOptions = {}
  Configuration for tracking layout shifts.
Returns () => void
A function to stop tracking CLS.
Example
```
import { startLayoutShiftTracking } from "datadog-ux-utils/layoutShifts";

const stopTracking = startLayoutShiftTracking({
  onChange: (cls, entry) => {
    console.log("CLS updated:", cls, entry);
  }
});

// Stop tracking later:
stopTracking();
```
- Defined in src/perf/layoutShifts.ts:36