Automatically serialize/deserialize Java 8 datatype with `jersey-media-json-jackson`

As of today, in order to serialize/deserialize the "new" datatypes introduced in Java 8 (e.g. `Optional`), you need to provide a custom `ObjectMapper` (as explained [here](https://jersey.github.io/documentation/latest/media.html#d0e8188)) and register the corresponding Jackson extension for handling those types (i.e. [jackson-modules-java8](https://github.com/FasterXML/jackson-datatype-jdk8) for Jackson < 2.8.5 and [jackson-modules-java8](https://github.com/FasterXML/jackson-modules-java8) for Jackson >= 2.8.5).

I guess it would be nice to provide this functionality out of the box.