events: show throw stack trace for uncaught exception

Show the stack trace for the `eventemitter.emit('error')` call
in the case of an uncaught exception.

Previously, there would be no clue in Node’s output about where
the actual `throw` comes from.

PR-URL: https://github.com/nodejs/node/pull/19003


Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>