ref(node-experimental): Reorder files into opentelemetry folder

[mydea]

To keep things better together, and in preparation for follow up PRs with more OTEL-specific stuff.

Nothing functionally changes here, this is just to keep follow up PRs more readable as there is a lot going on...

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	75.58 KB (-0.05% 🔽)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	31.46 KB (-0.15% 🔽)
@sentry/browser - Webpack (gzipped)	22.06 KB (-0.2% 🔽)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	70.27 KB (-0.03% 🔽)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	28.57 KB (-0.15% 🔽)
@sentry/browser - ES6 CDN Bundle (gzipped)	20.65 KB (-0.15% 🔽)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	222.17 KB (-0.01% 🔽)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	86.57 KB (-0.13% 🔽)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	61.42 KB (-0.18% 🔽)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	31.43 KB (-0.15% 🔽)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	75.6 KB (-0.05% 🔽)
@sentry/react - Webpack (gzipped)	22.09 KB (-0.2% 🔽)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	93.48 KB (-0.03% 🔽)
@sentry/nextjs Client - Webpack (gzipped)	51.04 KB (-0.11% 🔽)