feat(browser): Export BrowserTracing from package

[AbhiPrasad]

closes #7342

Building on the work in #7345, this PR exports BrowserTracing from the @sentry/browser package.

This means performance monitoring for the browser now looks like so:

import * as Sentry from '@sentry/browser';

Sentry.init({
  dsn: "__DSN__",
  tracesSampleRate: 1.0,
  integrations: [new Sentry.BrowserTracing()]
});

If you don't want to use BrowserTracing, you'll have to add the tracing extensions yourself:

import * as Sentry from '@sentry/browser';

Sentry.addTracingExtensions();

Sentry.init({
  dsn: "__DSN__",
  tracesSampleRate: 1.0,
});

[AbhiPrasad]

Have to bump this so that we get around jestjs/jest#9771, which requires Jest >= 28

[AbhiPrasad]

One day I'll merge this

and it will be glorious!

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.89 KB (+3.81% 🔺)
@sentry/browser - ES5 CDN Bundle (minified)	62.24 KB (-0.5% 🔽)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	19.62 KB (+4.6% 🔺)
@sentry/browser - ES6 CDN Bundle (minified)	55.32 KB (-0.38% 🔽)
@sentry/browser - Webpack (gzipped + minified)	20.56 KB (+0.29% 🔺)
@sentry/browser - Webpack (minified)	62.32 KB (-6.98% 🔽)
@sentry/react - Webpack (gzipped + minified)	20.6 KB (+0.36% 🔺)
@sentry/nextjs Client - Webpack (gzipped + minified)	47.48 KB (-1.5% 🔽)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	28.27 KB (+3.94% 🔺)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	26.75 KB (+5.07% 🔺)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	44.41 KB (+3.14% 🔺)
@sentry/replay - Webpack (gzipped + minified)	37.55 KB (+1.22% 🔺)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	62.84 KB (+3.36% 🔺)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	55.87 KB (+3.1% 🔺)

[AbhiPrasad]

Closing this because it will break webpack 4 :(

We can only make this change in v8.