UMRMeshBodyHolder

Because physics cooking uses [GetOuter()](API\Runtime\CoreUObject\UObject\UObjectBase\GetOuter) to get the [IInterface_CollisionDataProvider](API\Runtime\Engine\Interfaces\IInterface_CollisionDataProvider) and provides no way to determine which physics body it is currently working on we are wrapping each body in this Holder so that it can be the Outer and provide the correct data.