Add debugging for matching of converters

Summary

implements https://gitlab.com/caosdb/caosdb-crawler/-/issues/53

Focus

I removed the function that was supposed to be overwritten by subclasses in favor of an argument for the decorator that controls the behavior of the debugging. I think this is the version with less boiler plate code.

Test Environment

Try it out yourself ;-)

Unittests cover it only vaguely, but I think it is sufficient for a debugging feature.

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