[Feature Request]: Add API entity display registry event

[mysticdrew]

Describe the new feature.

Add a registry event so that Addon devs can supply an entity class and an image for entities that do not conform to the normal minecraft types we look for in JourneyMap.

Proposed event.
EntityDisplayRegistrationEvent.

register(Class<Entity> cls, ResourceLocation imageLocation, Type... types)

enum Type {
  HOSTILE,
  NPC, 
  PASSIVE, 
  PET,
}

Images

No response