feat: Collision lifecycle convenience methods on Actor

[eonarheim]

===:clipboard: PR Checklist :clipboard:===

• 📌 issue exists in github for these changes
• 🔬 existing tests still pass
• 🙈 code conforms to the style guide
• 📐 new tests written and passing / old tests updated with new scenario(s)
• 📄 changelog entry added (or not needed)

==================

This PR adds new collision lifecycle convenience methods to Actor! This was possible before by wiring up an event handler. This is a super common pattern so now it's moved to Actor!

class MyActor extends ex.Actor {
  constructor(args: ex.ActorArgs) {
    super(args);
  }
  onPreCollisionResolve(self: ex.Collider, other: ex.Collider, side: ex.Side, contact: ex.CollisionContact): void {
    
  }
  onPostCollisionResolve(self: ex.Collider, other: ex.Collider, side: ex.Side, contact: ex.CollisionContact): void {
    
  }
  onCollisionStart(self: ex.Collider, other: ex.Collider, side: ex.Side, contact: ex.CollisionContact): void {
    
  }
  onCollisionEnd(self: ex.Collider, other: ex.Collider): void {
    
  }
}

[alanag13]

Probably meant other collision end

[alanag13]

Missing word, probably frame, after Fires every

[eonarheim]

Oh yup, should read "fires for every collision resolution for a confirmed contact"