trace_events: add node.promises category, rejection counter

Allow the trace event log to include a count of unhandled rejections
and handled after rejections. This is useful primarily as a quick
check to see if rejections may be going unhandled (and unnoticed
in a process).

PR-URL: https://github.com/nodejs/node/pull/22124


Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>