feat(sveltekit): Register a route provider backed by reported route ids

[logaretm]

Registers a route provider for SvelteKit, for both the Kit 2 and Kit 3 variants.

SvelteKit has no public route matcher and page.route.id is not available synchronously, so this is the first cache-backed provider: it answers from route ids the instrumentation has already reported rather than by matching. Both variants already read the route id to rename the span, so they record it on the way through.

Adds createCachedRouteProvider to core for this, since Solid and Angular need the same thing. Keeps the statefulness private to the provider, so the API stays URL in, string out.

Part of #23556

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	28.56 kB	-	-
@sentry/browser - with treeshaking flags	26.92 kB	-	-
@sentry/browser - with treeshaking flags tracing without tracing	26.82 kB	-	-
@sentry/browser (incl. Tracing)	48.96 kB	+0.43%	+207 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)	48.97 kB	+0.43%	+205 B 🔺
@sentry/browser (incl. Tracing, Profiling)	51.89 kB	+0.41%	+211 B 🔺
@sentry/browser (incl. Tracing, Replay)	88.47 kB	+0.28%	+245 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	77.8 kB	+0.23%	+173 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	93.16 kB	+0.25%	+225 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	106.11 kB	+0.24%	+253 B 🔺
@sentry/browser (incl. Feedback)	46.05 kB	-	-
@sentry/browser (incl. sendFeedback)	33.62 kB	-	-
@sentry/browser (incl. FeedbackAsync)	38.73 kB	-	-
@sentry/browser (incl. Metrics)	29.51 kB	-	-
@sentry/browser (incl. Logs)	29.8 kB	-	-
@sentry/browser (incl. Metrics & Logs)	30.43 kB	-	-
@sentry/react	30.3 kB	-	-
@sentry/react (incl. Tracing)	51.17 kB	+0.45%	+225 B 🔺
@sentry/vue	35.73 kB	-	-
@sentry/vue (incl. Tracing)	51.46 kB	+0.87%	+440 B 🔺
@sentry/svelte	28.59 kB	-	-
CDN Bundle	30.72 kB	+1.23%	+372 B 🔺
CDN Bundle (incl. Tracing)	49.82 kB	+0.89%	+438 B 🔺
CDN Bundle (incl. Logs, Metrics)	32.98 kB	+1.24%	+402 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)	51.7 kB	+0.88%	+450 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)	73.51 kB	+0.47%	+337 B 🔺
CDN Bundle (incl. Tracing, Replay)	87.28 kB	+0.49%	+421 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	89.15 kB	+0.47%	+417 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	93.2 kB	+0.44%	+400 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	95.14 kB	+0.53%	+498 B 🔺
CDN Bundle - uncompressed	91.23 kB	+1.43%	+1.28 kB 🔺
CDN Bundle (incl. Tracing) - uncompressed	148.6 kB	+0.96%	+1.4 kB 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed	97.53 kB	+1.34%	+1.28 kB 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	154.29 kB	+0.92%	+1.4 kB 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	226.69 kB	+0.57%	+1.28 kB 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	268.1 kB	+0.53%	+1.4 kB 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	273.77 kB	+0.52%	+1.4 kB 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	281.8 kB	+0.5%	+1.4 kB 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	287.46 kB	+0.49%	+1.4 kB 🔺
@sentry/nextjs (client)	53.99 kB	+0.8%	+428 B 🔺
@sentry/sveltekit (client)	49.74 kB	+1.13%	+551 B 🔺
@sentry/core/server	65.67 kB	-	-
@sentry/core/browser	52.26 kB	+0.77%	+395 B 🔺
@sentry/node	123.77 kB	+0.02%	+18 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)	85.53 kB	-	-
@sentry/node - without tracing	88.03 kB	+0.02%	+14 B 🔺
@sentry/node - without channel injection	103.18 kB	+0.03%	+22 B 🔺
@sentry/aws-serverless	96.42 kB	+0.03%	+27 B 🔺
@sentry/cloudflare (withSentry) - minified	201.04 kB	-	-
@sentry/cloudflare (withSentry)	500.26 kB	-	-

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