Swift

[FSSDK-11373] add holdout support and refactor decision logic in DefaultDecisionService #673

Job	Run time
lint	32s
prepare_for_release	0s
release	0s
integration_tests / integration_tests	5s
lint_markdown_files / lint_markdown	1m 27s
unittests / unittests (16.1, iPhone 14, OptimizelySwiftSDK-iOS, iphonesimulator, iOS Simulator, iOS, 14.1)	18m 39s
unittests / unittests (16.2, iPhone 14, OptimizelySwiftSDK-iOS, iphonesimulator, iOS Simulator, iOS, 14.2)	14m 49s
unittests / unittests (16.4, iPad Air (5th generation), OptimizelySwiftSDK-iOS, iphonesimulator, iOS Simulato...	16m 20s
unittests / unittests (16.1, Apple TV, OptimizelySwiftSDK-tvOS, appletvsimulator, tvOS Simulator, tvOS, 14.1)	10m 15s
	1h 2m 7s

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