breaking: fix serialization issues in BaseService#update and use JsonPatch for updatePartial

[LukasLohoff]

Description

Fixes issues with properties being overridden by removing the serialization in BaseService#update.

Extracted from #515:

Herein the update method is updated to not serialize the update candidate anymore. In addition the updatePartial has been reworked to make use of JSON Patch and the @DynamicUpdate annotation is presented for all entities.

❗ Breaking change - Migration notes: ❗

1. BaseService#updatePartial changed its method signature.

Old:

public S updatePartial(Long entityId, S entity, Map<String, Object> values)

New:

public S updatePartial(S entity, JsonMergePatch patch)

Projects which override updatePartial or use it directly need to update their code accordingly.

2. BaseController#updatePartial changed its signature

Projects using the endpoint PATCH /{entityClass}/{id} should update their client code:

• supplying the entity id in the json body is no longer necessary

3. Annotate your hibernate models with @DynamicUpdate

For more information see https://www.baeldung.com/spring-rest-json-patch#http-patch-request

Related issues or pull requests

• from Introduce uuid field for all entities #515
• fixes BaseService.update returns object that is not a hibernate proxy #450
  • updatePartial still uses serialization and

Pull request type

• Bugfix
• Feature
• Dependency updates
• Tests
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe)

Do you introduce a breaking change?

• Yes
• [] No

Checklist

• I understand and agree that the changes in this PR will be licensed under the
  Apache Licence Version 2.0.
• I have followed the guidelines for contributing.
• The proposed change fits to the content of the code of conduct.
• I have added or updated tests and documentation, and the test suite passes (run mvn test locally).
• I have added a screenshot/screencast to illustrate the visual output of my update.

[LukasLohoff]

@terrestris/devs Please review