feat: Export getSpanDescendants() everywhere

[mydea]

This can be used instead of spanRecorder going forward.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	77.37 KB (-0.02% 🔽)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	68.58 KB (-0.01% 🔽)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	72.5 KB (0%)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	62.14 KB (-0.01% 🔽)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	32.84 KB (0%)
@sentry/browser (incl. browserTracingIntegration) - Webpack (gzipped)	32.84 KB (0%)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	31.34 KB (-0.02% 🔽)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	31.35 KB (0%)
@sentry/browser - Webpack (gzipped)	22.56 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	75.48 KB (+0.07% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	67.11 KB (+0.1% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	32.98 KB (+0.23% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped)	24.07 KB (+0.4% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	210.65 KB (+0.06% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	99.51 KB (+0.18% 🔺)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	71.79 KB (+0.2% 🔺)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	36.11 KB (+0.18% 🔺)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	68.87 KB (-0.01% 🔽)
@sentry/react - Webpack (gzipped)	22.59 KB (0%)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	85.29 KB (-0.01% 🔽)
@sentry/nextjs Client - Webpack (gzipped)	49.7 KB (0%)
@sentry-internal/feedback - Webpack (gzipped)	17.4 KB (-0.04% 🔽)

[krystofwoldrich]

I assume this will be exported in v8?

[mydea]

I assume this will be exported in v8?

Yes, this PR should export this everywhere so this can be used instead of span recorder! :)