Cache schemas by explicit ID in AJV8Validator.isValid #3721
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Reasons for making this change
fixes #3692
For allOf/anyOf schemas, subschemas are compiled each time they are encountered if they lack an $id field. This can create poor performance for large lists or recursive refs. Leveraging the ajv cache to cache subschemas that have been encountered before greatly improves performance.
Checklist
npm run test:update
to update snapshots, if needed.