ENH: Injectable GridField config components. #730

Job	Run time
CI / Context	1s
CI / Generate matrix	30s
CI / Check governance	0s
CI / 8.1 prf-low mysql57 phpunit all	3m 54s
CI / 8.2 mariadb phpunit all	3m 28s
CI / 8.3 mysql80 phpunit all	4m 35s
CI / 8.1 mysql57 phplinting	1m 29s
CI / 8.1 mysql57 endtoend root	5m 8s
CI / 8.3 mysql80 endtoend root	6m 20s
CI / 8.1 mysql57 js	3m 55s
CI / 8.1 mysql57 doclinting	2m 5s
CI / Dispatch tag patch release	0s
	31m 25s

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