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events: allow monitoring error events

Rodrigo Muino Tomonari requested to merge github/fork/dynatrace-oss-contrib/monitor-error-events into master

Installing an error listener has a side effect that emitted errors are considered as handled. This is quite bad for monitoring/logging tools which tend to be interested in errors but don't want to cause side effects like swallow an exception.

There are some workarounds in the wild like monkey patching emit or remit the error if monitoring tool detects that it is the only listener but this is error prone and risky.

This PR allows to install a listener to monitor errors with the side effect to consume the error. To avoid conflicts with other events it exports a symbol on EventEmitter which owns this special meaning.

Refs: https://github.com/open-telemetry/opentelemetry-js/issues/225

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

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