perf(node): Store normalized request for processing

[AbhiPrasad]

This should help reduce the memory pressure of the SDK as we don't store
the entire request in memory anymore.

resolves #15528

[AbhiPrasad]

Looks like the express e2e test is failing, but I can't reproduce this locally

 Polling for error eventId: 7f78d75287254a28acbf303f0893379b
  ✓  2 [chromium] › tests/send-to-sentry.test.ts:28:5 › Sends transaction to Sentry (4.0s)
  ✘  1 [chromium] › tests/send-to-sentry.test.ts:9:5 › Sends exception to Sentry (1.5m)


  1) [chromium] › tests/send-to-sentry.test.ts:9:5 › Sends exception to Sentry ─────────────────────

    Error: expect(received).toBe(expected) // Object.is equality

    Expected: 200
    Received: 404

    Call Log:
    - Timeout 90000ms exceeded while waiting on the predicate

      15 |   console.log(`Polling for error eventId: ${exceptionId}`);
      16 |
    > 17 |   await expect
         |   ^
      18 |     .poll(
      19 |       async () => {
      20 |         const response = await fetch(url, { headers: { Authorization: `*** } });
        at /home/runner/work/sentry-javascript/sentry-javascript/dev-packages/e2e-tests/test-applications/node-express-send-to-sentry/tests/send-to-sentry.test.ts:17:3

[AbhiPrasad]

Looks like there was an issue with RPC duration spiking: https://sentry.sentry.io/issues/5136810156/?project=1&query=is%3Aunresolved%20issue.priority%3A%5Bhigh%2C%20medium%5D&referrer=issue-stream&sort=date&statsPeriod=1h&stream_index=2