Implement @oneOf input types #586

Job	Run time
Lint (18.x)	46s
Lint (19.x)	50s
Lint (20.x)	46s
Lint (21.x)	53s
Build and run integration tests (18.x)	2m 0s
JS Tests (16.x)	3m 25s
Build and run integration tests (19.x)	2m 2s
JS Tests (18.x)	3m 8s
Build and run integration tests (20.x)	1m 56s
JS Tests (19.x)	3m 6s
Build and run integration tests (21.x)	1m 30s
JS Tests (20.x)	2m 54s
JS Tests (21.x)	3m 0s
Publish to NPM	0s
	26m 16s

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