Swift

Add `PersistentContainerStorage` #92

Job	Run time
Android (6.1, aarch64)	3m 21s
macOS (release, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	11m 42s
Linux (swift:6.0.3, debug, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	1m 54s
Android (nightly-6.2, aarch64)	3m 41s
Linux (swift:6.0.3, release)	13m 56s
Linux (swift:6.0.3, debug)	1m 59s
macOS (release)	12m 7s
Android (6.1, x86_64)	3m 1s
macOS (debug)	1m 56s
Linux (swift:6.1.2, release, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	11m 52s
macOS (debug, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	2m 33s
Linux (swift:6.1.2, debug, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	2m 6s
Linux (swift:6.0.3, release, SWIFT_BUILD_DYNAMIC_LIBRARY=1)	13m 14s
Android (nightly-6.2, x86_64)	4m 31s
Linux (swift:6.1.2, debug)	1m 51s
Linux (swift:6.1.2, release)	12m 26s
	1h 42m 10s

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