feat: common event system

[sekwah41]

Take a look at how both Fabric and Forge do their events and try to make one that can hook into the existing events they have, as well as take into account maintainability as well as possible performance.

Basically as long as you can make changes under the hood without changing the API side its fine.

[sekwah41]

The options its to have one central event bus or have each event have a list of its own listeners.

I think each event bus having its own list or handling it that way may be the cleanest, however having it filter them and then push them onto the individual bus could work pretty well.

Also want to take a look at ways of doing custom events so mods can talk to each other.