Test

Convert hooks system to a middleware system #963

Job	Run time
@dataplan/pg tests / build (12, 20.x)	3m 31s
PostGraphile mutation tests (exported as typeDefs) / build (12, 20.x)	8m 30s
PostGraphile mutation tests (exported as graphql-js) / build (12, 20.x)	8m 47s
PostGraphile mutation tests / build (12, 20.x)	3m 21s
PostGraphile polymorphic query tests / build (12, 20.x)	3m 11s
PostGraphile polymorphic query tests (exported as graphql-js) / build (12, 20.x)	7m 28s
PostGraphile polymorphic query tests (exported as typeDefs) / build (12, 20.x)	6m 14s
PostGraphile v4 queries tests / build (12, 20.x)	4m 0s
PostGraphile v4 queries tests (exported as graphql-js) / build (12, 20.x)	16m 23s
PostGraphile v4 queries tests (exported as typeDefs) / build (12, 20.x)	12m 27s
PostGraphile schema tests / build (12, 20.x)	6m 7s
Small package tests / build (12, 20.x)	3m 6s
	1h 23m 5s

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