Instrument NestJS event listeners

[nicohrubec]

https://docs.nestjs.com/techniques/events#listening-to-events

Uses an @OnEvent decorator that we can hook into.

[chargome]

Follow-up: With #14307 we only instrument event handlers per se and do not handle more complex operations like propagating traceId across events as the current solution seems to work fine. If the need for this comes up in the future we could look into patching the event queue (assuming there is one available in event-emitter) and enriching the events there directly.

[github-actions]

A PR closing this issue has just been released 🚀

This issue was referenced by PR #14307, which was included in the 8.39.0 release.