tech(entity): Introduce metadata system (#72)

[entity] fix use storeAlias to nullify (#69)

[store] post nil when alias is removed (#67)

[node] reintroduce applyChildrenChanges property (#64)

fix(store): Fixed multiple store not working when alias is a collecti…

…on (#62)

fix(alias): Fix alias not enqueued when one object in collection chan…

…ges (#60)

fix(store): Fixed `storeAlias` not storing relationships (#59)

tech(observer): Use registry to observe arrays (#57)

feat(store): Make stamp optional (#52)

fix(collection): Fixed `assign` not working with custom collection (#41)