ref(tracing): Add origin to spans

[mydea]

This adds an origin to all spans, which defaults to manual but is set to something more meaningful for all our auto instrumentation.

I tried to come up with reasonable origin names, I hope it makes sense everywhere 😅 Also note that this now uses a new TS feature which seems to be correctly transpiled to TS 3.8, as far as I can tell! 🎉

Closes #8510

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	75.26 KB (+0.05% 🔺)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	31.22 KB (+0.05% 🔺)
@sentry/browser - Webpack (gzipped)	21.85 KB (+0.02% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	69.79 KB (+0.07% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	28.24 KB (+0.12% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped)	20.18 KB (-0.02% 🔽)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	220.34 KB (+0.14% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	85.17 KB (+0.34% 🔺)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	59.88 KB (+0.04% 🔺)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	31.15 KB (+0.14% 🔺)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	75.28 KB (+0.06% 🔺)
@sentry/react - Webpack (gzipped)	21.88 KB (+0.02% 🔺)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	93.09 KB (+0.06% 🔺)
@sentry/nextjs Client - Webpack (gzipped)	50.8 KB (+0.13% 🔺)

[AbhiPrasad]

Adding origin to a transaction does nothing atm right?

[Lms24]

Adjusted the origins of all packages (mostly navigation and pageload ops)

[Lms24]

l: (or no action required) we might wanna streamline some of the other assignments here as well but it's ouf of scope for this PR. feel free to ignore

[mydea]

Adding origin to a transaction does nothing atm right?

It's not shown anywhere at least, as far as I can tell!