Test

Convert hooks system to a middleware system #967

Job	Run time
@dataplan/pg tests / build (12, 20.x)	3m 33s
PostGraphile v4 queries tests / build (12, 20.x)	3m 51s
PostGraphile v4 queries tests (exported as graphql-js) / build (12, 20.x)	16m 54s
PostGraphile polymorphic query tests / build (12, 20.x)	3m 6s
PostGraphile polymorphic query tests (exported as graphql-js) / build (12, 20.x)	7m 27s
PostGraphile polymorphic query tests (exported as typeDefs) / build (12, 20.x)	6m 6s
PostGraphile v4 queries tests (exported as typeDefs) / build (12, 20.x)	12m 14s
PostGraphile mutation tests / build (12, 20.x)	3m 25s
PostGraphile mutation tests (exported as graphql-js) / build (12, 20.x)	9m 15s
PostGraphile mutation tests (exported as typeDefs) / build (12, 20.x)	7m 57s
PostGraphile schema tests / build (12, 20.x)	6m 7s
Small package tests / build (12, 20.x)	3m 23s
	1h 23m 18s

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