Event handling improvements: events over WebSocket, endpoint for events routing data, event dispatch error handling

[tkurki]

feature: refactor Events handling

• Add the ability to 'subscribe' to events on the server with a comma delimited list of events in the events query parameter of the WebSocket connection url
• Add a safe way to emit server events: dispatching events to listeners is inside try..catch so that a listener throwing will not disturb other listeners. Logic copied from https://github.com/MetaMask/safe-event-emitter/blob/main/index.ts Fixes #1467.
• Add emitWithEmitterId that allows gathering stats about emitters and their event flow
• add server api /skServer/eventsRoutingData to expose statistics as well as events routing data event emitters and listeners
• add event canboatjs:unparsed:data to provide access to n2k data that canboatjs can not parse
• add events canboatjs:error and canboatjs:warning to expose them over the events api
• add emitter specific events: all events that are emitted using the new mechanism will also be available under an emitter specific event emitterId:eventName. This allows listening to output of a specific connection/plugin

[tkurki]

The perf impact from these changes seems negligible: on my mac non-throttled n2k-from-file without any active plugins and only admin ui as client gives me 52 k deltas/s in master, 51k deltas/s with these changes.

@panaaj @sbender9 can you have a look at this and give it a go, so that there's nothing obvious broken?

[panaaj]

Tested OK for me.