[WIP] Enhance slr feature#559

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DominikVoigt wants to merge 8 commits intomainfrom

Commits on Sep 8, 2021

Implement data model and de-/serialization to allow to define library specific query refinements and modify tests accordingly.
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Make library fetchers use the custom queries if defined for a library.
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Commits on Sep 16, 2021

Add fetcher delegator
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Commits on Sep 20, 2021

Modify fetchers towards goal
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