[ApolloPagination] Additional conveniences for offset pagination #859

Job	Run time
Cocoapods Integration Tests - macOS	18s
Codegen Test Configurations - macOS	7m 18s
changes	7s
Run swift build for SPM packages (apollo-ios)	1m 6s
Run swift build for SPM packages (apollo-ios-codegen)	1m 22s
Run swift build for SPM packages (apollo-ios-pagination)	1m 40s
Run Tuist Generation	1m 14s
Verify Frontend Bundle Latest - macOS	0s
Apollo Integration Tests - macOS	0s
Apollo Unit Tests - macOS	10s
Codegen CLI Unit Tests - macOS	15s
Codegen Lib Unit Tests - macOS	36s
ApolloPagination Unit Tests - macOS	2m 53s
	16m 59s

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