feat(v7/core): Deprecate Hub class

[Lms24]

This PR deprecated the Hub class which I'll remove in a follow-up PR in v8. The replacement is to mostly use the scope-centered APIs. Most APIs that relied on the Hub class (unfortunately quite a lot - looks like we weren't really consistent in using the Hub interface instead of the class) are already deprecated and already removed in v8.

The one exception where we have to break a little is getCurrentHub which we decided to still keep around as deprecated throughout the lifetime of v8. Since getCurrentHub returns the class instead of the interface, I suggest we simply switch it to the interface. If the class exports more members than the interface declares, we'll probably need to add them to the interface.

ref #11482

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	80.54 KB (+0.07% 🔺)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	71.52 KB (+0.08% 🔺)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	75.54 KB (+0.08% 🔺)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	65.16 KB (+0.09% 🔺)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	35.46 KB (+0.15% 🔺)
@sentry/browser (incl. browserTracingIntegration) - Webpack (gzipped)	35.34 KB (+0.14% 🔺)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	31.53 KB (+0.03% 🔺)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	31.54 KB (+0.03% 🔺)
@sentry/browser - Webpack (gzipped)	22.74 KB (+0.04% 🔺)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	78.65 KB (+0.08% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	70.02 KB (+0.08% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	35.8 KB (+0.1% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped)	25.18 KB (+0.04% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	220.42 KB (+0.06% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	108.23 KB (+0.11% 🔺)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	75.49 KB (+0.01% 🔺)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	39.03 KB (+0.1% 🔺)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	72.01 KB (+0.07% 🔺)
@sentry/react - Webpack (gzipped)	22.78 KB (+0.04% 🔺)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	89.85 KB (+0.05% 🔺)
@sentry/nextjs Client - Webpack (gzipped)	53.99 KB (+0.08% 🔺)
@sentry-internal/feedback - Webpack (gzipped)	17.3 KB (0%)