Review and merge type-hints

Decided whether to continue !67 (merged): -> Jein. Type hints are re-done due to too many merge conflicts.
Repeat s.th. pipelines from #143 (closed) run successfully
Create follow-ups for more type hints, broken docu etc.: #193 (closed) #192 (closed) #191 (closed)

Edited Mar 28, 2024 by Joscha Schmiedt

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