feat(flags): add node support for generic featureFlagsIntegration and move utils to core

[aliu39]

The featureFlagsIntegration is an integration to manually buffer feature flags on evaluation, and capture them in event contexts and span attributes. This PR moves it from browser to core, as well as the shared functionality/utils of all FF integrations (no browser specific logic).

Browser exports and functionality is unchanged. Per @AbhiPrasad 's recommendation I've manually exported the integration in all the packages zodErrorsIntegration is exported. Note many backend pkgs use a wildcard (*) export from node.

TODO:

• [x] add node-integration-tests
• [ ] update platform docs

Part of

• https://github.com/getsentry/team-replay/issues/510

[github-actions[bot]]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	23.99 kB	-	-
@sentry/browser - with treeshaking flags	23.76 kB	-	-
@sentry/browser (incl. Tracing)	38.79 kB	-	-
@sentry/browser (incl. Tracing, Replay)	76.92 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	70 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	81.68 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	93.75 kB	-	-
@sentry/browser (incl. Feedback)	40.73 kB	-	-
@sentry/browser (incl. sendFeedback)	28.7 kB	-	-
@sentry/browser (incl. FeedbackAsync)	33.59 kB	-	-
@sentry/react	25.76 kB	-	-
@sentry/react (incl. Tracing)	40.78 kB	-	-
@sentry/vue	28.36 kB	-	-
@sentry/vue (incl. Tracing)	40.66 kB	-	-
@sentry/svelte	24.01 kB	-	-
CDN Bundle	25.48 kB	-	-
CDN Bundle (incl. Tracing)	38.96 kB	-	-
CDN Bundle (incl. Tracing, Replay)	74.81 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	80.23 kB	-	-
CDN Bundle - uncompressed	74.48 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	115.3 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	229.35 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	242.18 kB	-	-
@sentry/nextjs (client)	42.44 kB	-	-
@sentry/sveltekit (client)	39.28 kB	-	-
@sentry/node	150.76 kB	-	-
@sentry/node - without tracing	98.52 kB	-	-
@sentry/aws-serverless	124.27 kB	-0.01%	-1 B 🔽

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