feat(oas31): add support for JSON Schema 2020-12 example keyword (#8652)

Refs #8513

src/core/plugins/oas31/json-schema-2020-12-extensions/fn.js

@@ -0,0 +1,12 @@
+/**
+ * @prettier
+ */
+export const makeIsExpandable = (original, { fn }) => {
+  if (typeof original !== "function") {
+    return null
+  }
+
+  const { hasKeyword } = fn.jsonSchema202012
+
+  return (schema) => original(schema) || hasKeyword(schema, "example")
+}