Add controller integration tests

[dnlkoch]

Description

This adds some basic integration tests for the CRUD-REST interfaces (/applications, /layers, /groups, /users) checking if:

• An anonymous has no permission to create, read, update and delete an entity.
• An admin user has the permission to create, read, update and delete all entities (without any particular permissions set).
• A default user has no permission to create, read, update and delete an entity (without any particular permissions set).
• A default user has the permission to create, read, update and delete an entity (while having the particular permissions set).

Depends on #405 and #406.

Please review @terrestris/devs.

Related issues or pull requests

--

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.

[github-actions]

license-eye has totally checked 326 files.

Valid	Invalid	Ignored	Fixed
228	8	90	0

Click to see the invalid file list

• shogun-lib/src/test/java/de/terrestris/shogun/lib/config/AuditConfig.java
• shogun-lib/src/test/java/de/terrestris/shogun/lib/config/MethodSecurityConfig.java
• shogun-lib/src/test/java/de/terrestris/shogun/lib/config/WebConfig.java
• shogun-lib/src/test/java/de/terrestris/shogun/lib/config/WebSecurityConfig.java
• shogun-lib/src/test/java/de/terrestris/shogun/lib/controller/ApplicationControllerTest.java
• shogun-lib/src/test/java/de/terrestris/shogun/lib/controller/BaseControllerTest.java
• shogun-lib/src/test/java/de/terrestris/shogun/lib/controller/IBaseController.java
• shogun-lib/src/test/java/de/terrestris/shogun/lib/controller/UserControllerTest.java

[dnlkoch]

Thanks for the review!