Resolve "Backend Refactor: Entities and API DTOs"

I refactored the API and Entities into separate modules, they are now in the $PROJECT_ROOT/fda-metadata-db folder. Other changes:

1. Upgraded Spring Boot Parent 2.3.4 -> 2.3.10.RELEASE on all Java-based services
2. Spring Cloud now also SR8.Hoxton -> 3.0.1
3. Removed some unnecessary Maven code for dependencymanagement
4. Your DTOs and Entities now comply with the Java-standard CamelCase naming convention (no other changes in your code, just renaming)
5. All services have either implemented tests or mocks, they all are ready for test implementation

What should be fulfilled to be able to merge into dev

• Please check if the data store works, I did not change very much, but due to the high refactoring it can be the case that some runtime stuff does not work as you intended

Closes #42

added scope::Backend status::Doing + 1 deleted label

For me this does not work sadly. I get errors with the docker container, that the manifest is missing and that all services are somehow crashing afterwards, because it could not create the metadata-database is my guess. But now, I do not trust any setup of mine anymore - so it could be an error only for me again.

The two errorcodes I get are (for all depending services):

 no main manifest attribute, in ./discovery.jar

ERROR Failed to initialize JPA EntityManagerFactory: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.tool.schema.spi.SchemaManagementException: Schema-validation: missing table [mdb_container]

added 7 commits

• 83faaf8b - all api and entity objects now have a builder, fixed service tests, fixed endpoint tests
• 803553e7 - fixed some container tests
• 1cc31cce - added database test mocks
• 7a29a58a - added some endpoint tests for database service
• 581342c1 - added 30 tests to database service
• d9c7dc59 - require the test db for testing
• eaf9caf5 - compiles on laptop

Compare with previous version

merged