feat: Abstract CRUD and Search System, Access Control Mechanism

[joelbarmettlerUZH]

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What does your PR change?

I added abstract classes that handle most of the simple CRUD and Search functionalities as well as an in-depth access control system.

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4 Bugs
0 Vulnerabilities
0 Security Hotspots
25 Code Smells

1.7% Coverage
0.0% Duplication

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