Workflow + Engine - Migrate creationDate to be auto created via Mongo Auditing

[tlawrie]

Use in-built spring-data-mongodb auditing to create the createdDate

1. Add spring-data-mongodb dependency
2. Annotate your main class with @EnableMongoAuditing
3. Add to your mongoDb entity class a field LocalDate creationDate
4. Annotate this new field with @CreatedDate

Open Questions

• Check what type of format this gets created in
• If it works, we can remove the code to do this manually on all entities.
• Are there any other benefits to @enablemongoauditing