Let the ruleset module know about metadata #4329
Merged
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In the past, it was first decided to make the individual modules independent of another, which also means that the ruleset module was independent of the metadata that it processed. In the meantime, that has become more relaxed, metadata is part of the API and can be used in modules. So, this now introduces metadata into ruleset module. This makes a lot of things easier and more understandable in the code, and is a prerequisite for further development. It also gets rid of complicated type parameters.
In the future, it can also be resolved that complex metadata could not be mapped if not defined in the ruleset, because the ruleset module could not be aware of it (#3762). Now it is, so that this problem, too, is easy to solve in a follow-up to this pull request.