Fixed JSON Schema output use "definitions" keyword instead of the previously used wrong "descriptors".
We now also include the title attribute for properties, using rest.description.$type.$property._title as i18n key. Titles are now also defaulted to the camel-case property name split up, lowercased and capitalized, e.g. "orderDate" will become "Order date".
JacksonMetadata now allows obtaining the Jackson serializer being used for a given type and exposes whether a property is considered read-only for Jackson.
Introduced JsonSchemaPropertyCustomizer to potentially tweak the JSON schema property definition. This is helpful in case custom JsonSerializers are implemented to also reflect the change in representation in the schema.
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