5.14.0

• [apm] feat: Add a simple heartbeat check, if activities don't change in 3 beats, finish the transaction (#2478)
• [apm] feat: Make use of the performance browser API to provide better instrumentation (#2474)
• [browser] ref: Move global error handler + unhandled promise rejection to instrument (#2475)
• [apm] ref: Always use monotonic clock for time calculations (#2485)
• [apm] fix: Add trace context to all events (#2486)