feat(node): Add eventLoopBlockIntegration

[timfish]

This PR:

• Adds eventLoopBlockIntegration which uses @sentry-internal/node-native-stacktrace to detect and capture blocked event loops
• Adds suite of integration tests to test all the functionality
• Bundling
  • Unlike the existing ANR integration, we can't bundle the worker code into a base64 string because there is a native module and all threads need to load the same native module
  • The worker is loaded via new Worker(new URL('./thread-blocked-watchdog.js', import.meta.url)) which will be bundled correctly by latest Vite and Webpack 5
  • For other bundlers you can add an extra entry point pointing at @sentry/node-native/thread-blocked-watchdog which should output tothread-blocked-watchdog.js next to your bundle.

Usage

If you instrument your application via the Node.js --import flag, this instrumentation will be automatically applied to all worker threads.

instrument.mjs

import * as Sentry from '@sentry/node';
import { eventLoopBlockIntegration } from '@sentry/node-native';

Sentry.init({
  dsn: '__YOUR_DSN__',
  // Capture stack traces when the event loop is blocked for more than 500ms
  integrations: [eventLoopBlockIntegration({ 
    threshold: 500, // defaults to 1000 ms 
    maxEventsPerHour: 5,  // defaults to 1
  })],
});

app.mjs

import { Worker } from 'worker_threads';

const worker = new Worker(new URL('./worker.mjs', import.meta.url));

// This main thread will be monitored for blocked event loops

worker.mjs

// This worker thread will also be monitored for blocked event loops too

setTimeout(() => {
  longWork();
}, 2_000);

Start your application:

node --import instrument.mjs app.mjs

Blocked events are captured with stack traces for all threads:

[AbhiPrasad]

Let's split this PR up

1. Adding just the @sentry/node-native package with no implementation. Same approach as #16652
2. the integration tests + main implementation (this PR)

[AbhiPrasad]

@sentry review