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).
These can be visualized in the Chrome trace events viewer as a stacked graph:
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines