feature: @oneOf input object support #1588

Job	Run time
Cocoapods Integration Tests - macOS	15s
changes	6s
Codegen Test Configurations - macOS	3m 6s
Run swift build for SPM packages (apollo-ios)	27s
Run swift build for SPM packages (apollo-ios-codegen)	28s
Run swift build for SPM packages (apollo-ios-pagination)	48s
Verify CLI Binary Archive - macOS	6s
Run Tuist Generation	2m 59s
Verify Frontend Bundle Latest - macOS	14s
Apollo Unit Tests - macOS	1m 42s
Codegen CLI Unit Tests - macOS	1m 47s
Codegen Lib Unit Tests - macOS	1m 55s
ApolloPagination Unit Tests - macOS	1m 28s
	15m 21s

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