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fix: Fire collisionend when collider deleted + Composite collision start/end strategy (#2931)

One stealth feature 
* onCollisionEnd events now include the last side and contact which is useful for collision logic

This PR fixes 2 issues:

1. Fixes an issue where a collider that was part of a contact that was deleted did not fire a collision end event, this was unexpected
2. Fixes an issue where you may want to have composite colliders behave as constituent colliders for the purposes of start/end collision events. A new property is added to physics config, the current behavior is the default which is `'together'`, this means the whole composite collider is treated as 1 collider for onCollisionStart/onCollisionEnd. Now you can configure a `separate` which will fire onCollisionStart/onCollisionEnd for every separate collider included in the composite (useful if you are building levels or things with gaps that you need to disambiguate). You can also configure this on a per composite level to mix and match `CompositeCollider.compositeStrategy`
![image](https://github.com/excaliburjs/Excalibur/assets/612071/e1a9c954-8a39-4402-bee6-dad9b42f9c08)

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