feat(remix): Export missing functions

[Lms24]

Looks like we missed re-exporting a couple of recently added functions in the Remix SDK. This PR adds the missing exports:

• addIntegration
• getClient
• getCurrentScope, getIsolationScope, getGlobalScope
• setMeasurement
• getActiveSpan
• startSpan, startSpanManual, startInactiveSpan
• continueTrace
• isInitialized

closes #10384

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	77.93 KB (+0.07% 🔺)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	69.13 KB (+0.1% 🔺)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	73.02 KB (+0.1% 🔺)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	62.78 KB (+0.11% 🔺)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	33.18 KB (+0.21% 🔺)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	31.32 KB (+0.13% 🔺)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	31.33 KB (+0.13% 🔺)
@sentry/browser - Webpack (gzipped)	22.6 KB (+0.28% 🔺)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	75.76 KB (+0.21% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	67.3 KB (+0.21% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	33.17 KB (+0.49% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped)	24.52 KB (+0.22% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	212.01 KB (+0.26% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	100.02 KB (+0.54% 🔺)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	73.35 KB (+0.25% 🔺)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	36.26 KB (+0.43% 🔺)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	69.54 KB (+0.09% 🔺)
@sentry/react - Webpack (gzipped)	22.63 KB (+0.24% 🔺)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	86.23 KB (+0.11% 🔺)
@sentry/nextjs Client - Webpack (gzipped)	50.53 KB (+0.17% 🔺)
@sentry-internal/feedback - Webpack (gzipped)	17.21 KB (0%)
@sentry/browser (incl. browserTracingIntegration) - Webpack (gzipped)	33.07 KB (added)

[mydea]

would be nice to have some tests somewhere (?) and/or some code to make this easier - it's always super brittle to ensure you add a new function to all packages for re-exporting 😬

[Lms24]

would be nice to have some tests somewhere (?) and/or some code to make this easier

yeah I also thought about this. We can somewhat assert on these exports in e2e tests (e.g. import them where we call init and throw if they're undefined) but this also doesn't scale well. I have an idea for a script but still need to try it out.