TraitAsType support #52
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This PR aims to add
TraitAsTypesupport. They are handled purely at the extractor side.If they occur in parameter types, they are replaced by type variables. If they occur in the return type, they are replaced by the concrete type that the function body returns.
I also added a placeholder type at the Lean side, which can be invoked with
_in the Lean definitions. This might be useful in the future.