ENH: Injectable GridField config components. #2

Job	Run time
CI / Context	1s
CI / Generate matrix	2m 22s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit all	4m 5s
CI / 8.2 mariadb phpunit all	3m 48s
CI / 8.3 mysql80 phpunit all	4m 24s
CI / 8.1 mysql57 phplinting	1m 45s
CI / 8.1 mysql57 endtoend root	4m 2s
CI / 8.3 mysql80 endtoend root	4m 47s
CI / 8.1 mysql57 js	3m 52s
CI / 8.1 mysql57 doclinting	2m 23s
CI / Dispatch tag patch release	0s
	31m 30s

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