Add _startProfiling and _stopProfiling JSI bindings for Hermes sampling profiler

[tomekzaw]

Summary

This PR adds _startProfiling and _stopProfiling JSI bindings in worklet runtimes that enable and disable Hermes sampling profiler on the Reanimated UI runtime.

I took some inspiration from https://github.com/margelo/react-native-release-profiler/blob/main/ios/ReleaseProfiler.mm.

Usage:

scheduleOnUI(() => {
  globalThis._startProfiling();
});

scheduleOnUI(() => {
  const path = globalThis._stopProfiling();
  console.log(`Trace saved to ${path})`);
});

The trace is saved on device and the path is returned from _stopProfiling so it can be printed to the console:

The trace file can be opened with https://www.speedscope.app/

Test plan