Add schema checker to `json` module #8421

Job	Run time
Ruby analysis (ubuntu-latest, default)	43s
Ruby analysis (macos-latest, default)	1m 10s
Ruby analysis (ubuntu-latest, linked)	49s
Ruby analysis (ubuntu-latest, nightly-latest)	40s
Ruby analysis (macos-latest, nightly-latest)	1m 21s
Ruby analysis (macos-latest, linked)	1m 1s
	5m 44s

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