Inconsistent event emits #4184

Support plan

• is this issue currently blocking your project? (yes/no): no
• is this issue affecting a production system? (yes/no): no

Context

• node version: n/a
• module version: 20.0.1
• environment (e.g. node, browser, native): node
• used with (e.g. hapi application, another framework, standalone, ...):
• any other relevant information:

This is a followup from comment in #4173 (review).

What problem are you trying to solve?

Have a consistent event interface for Hapi, where event emits cannot delay / abort server processing.

Do you have a new or modified API suggestion to solve the problem?

Don't wait for emit() promise, on server "start" and "stop", and subsequently don't return a promise from events.emit(). This should also enable much better performance, especially for events with no listeners.