Provide a default implementation of JpaCrudService.getId #59
Description
JpaCrudService defines an abstract method getId. Since the entities are JPA entities, it should be possible to reflect the id getter as a default implementation
https://github.com/AppJars/commons-backend/blob/6e7c9b2b3cb0d0b397cc795a51380945421eee70/commons-business-spring-impl/src/main/java/com/appjars/saturn/service/JpaCrudService.java#L40