Function SuspenseWatch

SuspenseWatch(__namedParameters: SuspenseWatchProps): Element
SuspenseWatch
Wraps a React.Suspense boundary and reports when the fallback remains visible longer than timeoutMs. A "slow" event is emitted once per suspend cycle (even if the fallback remains longer), and an optional "resolved" event is emitted when the content finally appears.

Implementation details:
- We insert tiny sentinels inside both the fallback and the content tree. Mount/unmount of those sentinels tell us when the boundary is suspended or has resolved.
- Each time the boundary re-suspends, a new cycle begins and the logic repeats.
- Telemetry uses addAction (and optionally addError) and is sampled.
Parameters
- __namedParameters: SuspenseWatchProps
Returns Element
Example
```
import { SuspenseWatch } from "@milliman/datadog-ux-utils/react/SuspenseWatch";

export function ResultsSection() {
  return (
    <SuspenseWatch
      id="ResultsSection"
      fallback={<Spinner label="Loading results…" />}
      options={{
        timeoutMs: 1500,
        sampleRate: 25,
        onSlow: ({ id, timeoutMs }) => {
          console.warn(`${id} still loading after ${timeoutMs}ms`);
        },
      }}
    >
      <ResultsList />
    </SuspenseWatch>
  );
}
```
- Defined in src/react/suspenseWatch.tsx:142