Adopt `swift-format` #96

Job	Run time
lint	26s
unit-tests / linux-unit (swift:5.8-jammy)	28s
unit-tests / linux-unit (swift:5.9-jammy)	29s
unit-tests / api-breakage	6m 6s
unit-tests / linux-unit (swift:5.10-noble)	25s
unit-tests / linux-unit (swift:6.0-noble)	5m 38s
unit-tests / linux-unit (swiftlang/swift:nightly-main-jammy)	6m 47s
unit-tests / macos-unit (macos-13, ~15.2)	16s
unit-tests / macos-unit (macos-14, latest-stable)	4m 30s
	25m 5s

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