feat(nextjs): Instrument app dir route handlers

[lforst]

Ref #7228

Instruments Next.js app dir route handlers. We add two new utility functions wrapRequestHandlerLikeFunctionWithErrorInstrumentation and wrapRequestHandlerLikeFunctionWithPerformanceInstrumentation that we immediately use to wrap the route handlers. It is planned that we migrate to these wrappers for all other Next.js functions (data-fetchers, API routes, etc.).

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.41 KB (+0.03% 🔺)
@sentry/browser - ES5 CDN Bundle (minified)	63.33 KB (+0.05% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.99 KB (+0.03% 🔺)
@sentry/browser - ES6 CDN Bundle (minified)	56.25 KB (+0.06% 🔺)
@sentry/browser - Webpack (gzipped + minified)	20.67 KB (+0.09% 🔺)
@sentry/browser - Webpack (minified)	67.55 KB (+0.17% 🔺)
@sentry/react - Webpack (gzipped + minified)	20.69 KB (+0.09% 🔺)
@sentry/nextjs Client - Webpack (gzipped + minified)	52.11 KB (+0.04% 🔺)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	33.66 KB (+0.03% 🔺)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	26.01 KB (+0.03% 🔺)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	43.18 KB (+0.03% 🔺)
@sentry/replay - Webpack (gzipped + minified)	37.19 KB (0%)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	61.31 KB (+0.02% 🔺)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	54.39 KB (+0.02% 🔺)

[github-actions]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[github-actions]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[lforst]

Superseded by #8832