Feature/user converter

[eheimbuch]

Proposed changes

Create automatic user converter which converts internal users to external if they log in through an external system like ldap. This automatic converted can be enabled in the global config. Also users can now be converted manually between internal and external.

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[sonarqubecloud]

SonarCloud Quality Gate failed.

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
14 Code Smells

26.0% Coverage
6.8% Duplication