Experimental support for `@eslint/json` #1101

Job	Run time
test-for-ubuntu-integrations	57s
test-for-mac-integrations	1m 22s
lint	1m 18s
test (18)	50s
test-and-coverage	57s
test-for-win-integrations	1m 41s
test (20)	48s
test-with-eslint6 (12.x)	54s
test (22)	49s
test-with-eslint7 (12.x)	43s
test-with-eslint8 (12.x)	47s
test-with-eslint7 (14.x)	43s
test-with-eslint8 (14.x)	47s
test-with-eslint7 (16.x)	44s
test-with-eslint8 (16.x)	46s
test-with-eslint8 (17.x)	4m 14s
	18m 20s

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