Jecs v0.2.0

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• Improved iteration speeds 20-40% by manually indexing rather than using next()
• Added world:parent(entity) and jecs.ChildOf respectively as first class citizen for building parent-child relationships.
• Give a parent to an entity with world:add($source, pair(ChildOf, $target))
• Use world:parent(entity) to find the target of the relationship.
• Use this if all you want to do is to prevent an entity from being matched against entity as opposed to world:delete(entity).
• Added luau types thanks to @alicesaidhi