Add QueryFormAdapter to compute queries for custom query forms #487

Job	Run time
build (mysql, 3.9)	5m 1s
build (mysql, 3.11)	4m 55s
build (postgres, 3.9)	5m 11s
build (postgres, 3.11)	5m 15s
Indicate completion to coveralls	0s
	20m 22s

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