ref(cloudflare): Prepare for WorkerEntrypoint

[JPeer264]

(preparation for #15942)

This PR is wether adding nor removing any functionality of the Cloudflare SDK. It is basically just splitting up the handler.ts into it smaller functions. So it may look huge, but it doesn't do anything.

---

Main changes:

• handler.ts -> withSentry.ts
• Single handler instrumentations of handler.ts moved into (instrumentations/worker/instrument*.ts)
  • "core functionality" of the instrumentation (first split)
  • and a ExportedHandler specific instrumentation (second split)

E.g. following is a pseudo code of the split

const withSentry = () => {
  // first split
  if ('fetch' in handler) {
    handler.fetch = new Proxy(handler.fetch {
      const options = getFinalOptions();
      
      // second split = "core functionaltiy" of fetch
      return withIsolationScope(() => startSpan())
    })
  }
}

When implementing the WorkerEntrypoint the "core functionality" part can easily be reused, without touching any further code.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	25.64 kB	-	-
@sentry/browser - with treeshaking flags	24.14 kB	-	-
@sentry/browser (incl. Tracing)	42.62 kB	-	-
@sentry/browser (incl. Tracing, Profiling)	47.28 kB	-	-
@sentry/browser (incl. Tracing, Replay)	81.43 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	71.01 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	86.14 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	98.39 kB	-	-
@sentry/browser (incl. Feedback)	42.44 kB	-	-
@sentry/browser (incl. sendFeedback)	30.31 kB	-	-
@sentry/browser (incl. FeedbackAsync)	35.36 kB	-	-
@sentry/browser (incl. Metrics)	26.92 kB	-	-
@sentry/browser (incl. Logs)	27.07 kB	-	-
@sentry/browser (incl. Metrics & Logs)	27.74 kB	-	-
@sentry/react	27.39 kB	-	-
@sentry/react (incl. Tracing)	44.95 kB	-	-
@sentry/vue	30.09 kB	-	-
@sentry/vue (incl. Tracing)	44.49 kB	-	-
@sentry/svelte	25.66 kB	-	-
CDN Bundle	28.27 kB	-	-
CDN Bundle (incl. Tracing)	43.51 kB	-	-
CDN Bundle (incl. Logs, Metrics)	29.13 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	44.35 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics)	68.21 kB	-	-
CDN Bundle (incl. Tracing, Replay)	80.34 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	81.25 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	85.88 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	86.77 kB	-	-
CDN Bundle - uncompressed	82.58 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	128.55 kB	-	-
CDN Bundle (incl. Logs, Metrics) - uncompressed	85.44 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	131.42 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	209.11 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	245.44 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	248.29 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	258.35 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	261.19 kB	-	-
@sentry/nextjs (client)	47.37 kB	-	-
@sentry/sveltekit (client)	43.07 kB	-	-
@sentry/node-core	52.27 kB	+0.02%	+7 B 🔺
@sentry/node	174.77 kB	+0.01%	+3 B 🔺
@sentry/node - without tracing	97.44 kB	+0.02%	+11 B 🔺
@sentry/aws-serverless	113.24 kB	+0.01%	+7 B 🔺

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