Implement capturing error type/msg/stacktrace as events per spec

[ericmustin]

👋 Hello all, just adding a quick issue here surfacing this Spec PR for adding error/exception reporting as events that include metadata for the error type, message, and stacktrace. open-telemetry/opentelemetry-specification#697

I think implementing this in opentelemetry-js could add value to the traces being generated, as currently error type and stacktrace aren't being explicitly captured (though it does look like some instrumentations set the error_name attribute).

Spec PR: open-telemetry/opentelemetry-specification#697

Was asked to make an issue on this by @obecny during discussion of a vendor exporter pr here #1316

[vmarchaud]

If i'm correct this is still being discussed a little bit, might be better to wait the merge before trying to implement anything

[dyladan]

Looks like it merged.