Experimental support for `@eslint/json` #1095

Job	Run time
test-for-win-integrations	2m 36s
test-for-mac-integrations	53s
lint	1m 18s
test (18)	50s
test-and-coverage	1m 5s
test (20)	48s
test-for-ubuntu-integrations	56s
test-with-eslint6 (12.x)	45s
test (22)	47s
test-with-eslint7 (12.x)	41s
test-with-eslint8 (12.x)	42s
test-with-eslint7 (14.x)	41s
test-with-eslint8 (14.x)	48s
test-with-eslint7 (16.x)	46s
test-with-eslint8 (16.x)	54s
test-with-eslint8 (17.x)	56s
	15m 26s

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