Introduce ground truth init configuration

[clemenshabedank]

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Introduced a configuration mechanism for GroundTruthInit with FMU packaging. Goes together with https://github.com/OpenSimulationInterface/open-simulation-interface/pull/407

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• [ ] I have performed a self-review of my own code.
• [ ] I have made corresponding changes to the documentation for osi-sensor-model-packaging.
• [ ] My changes generate no new warnings.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [ ] New and existing unit tests / Github Actions pass locally with my changes.