Introduce uuid field for all entities

[dnlkoch]

Description

This suggests to add an uuid field to all entities and an appropriate GET REST controller.

During testing the newly created interface #450 became an issue as well. 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.

TODOs

• Apply field to GraphQL models
• Apply field to rev tables

Related issues or pull requests

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Pull request type

• Bugfix
• Feature
• Dependency updates
• 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.