handleCoroutineException

Helper function for coroutine builder implementations to handle uncaught exception in coroutines.

It tries to handle uncaught exception in the following way:

• If there is CoroutineExceptionHandler in the context, then it is used.
• Otherwise, if exception is CancellationException then it is ignored (because that is the supposed mechanism to cancel the running coroutine)
• Otherwise:
  • if there is a Job in the context, then Job.cancel is invoked;
  • all instances of CoroutineExceptionHandler found via ServiceLoader are invoked;
  • current thread’s Thread.uncaughtExceptionHandler is invoked.