Adopt Swift Collections' `OrderedSet` and `OrderedDictionary`#3533

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WowbaggersLiquidLunch:adopt-swift-collections

Commits on Jun 20, 2021

replace TSC's `OrderedSet` and `OrderedDictionary` with Swift Collections’
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add swift-collections to `CMakeList`s and `bootstrap`
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[doc] add cloning swift-collection to bootstrap documentation
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