ref(nextjs): Export `BrowserTracing` integration directly from `@sentry/nextjs` (#3647)
ref(nextjs): Export `BrowserTracing` integration directly from `@sentry/nextjs` (#3647)

Mostly to make linters happy.
getsentry/raven-js,getsentry/raven-js,getsentry/raven-js,getsentry/raven-js