Experimental support for `@eslint/json` #1104

Job	Run time
lint	1m 20s
test-for-mac-integrations	1m 15s
test-and-coverage	59s
test (18)	53s
test (20)	52s
test-for-ubuntu-integrations	57s
test-for-win-integrations	1m 32s
test (22)	50s
test-with-eslint6 (12.x)	47s
test-with-eslint7 (12.x)	45s
test-with-eslint8 (12.x)	50s
test-with-eslint7 (14.x)	41s
test-with-eslint8 (14.x)	50s
test-with-eslint7 (16.x)	47s
test-with-eslint8 (16.x)	50s
test-with-eslint8 (17.x)	55s
	15m 3s

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