4.0.1

• [browser] feat: Show dropped event url in blacklistUrl/whitelistUrl debug mode
• [browser] feat: Use better event description instead of event_id for user-facing logs
• [core] ref: Create common integrations that are exposed on @sentry/core and reexposed through browser/node
• [core] feat: Debug integration
• [browser] ref: Port TraceKit to TypeScript and disable TraceKit's remote fetching for now