Group imports and exports in exports module #2468
                
     Merged
            
            
          
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Follow-up to #2467 and work towards #1962: Movin all imports and exports into a newly created exports folder we get increased visibility of the dependencies. Those work as follows.
This PR is a no-op, but after it we can cut out this entire tree for builds that target wasm32-unknown-unknown but not the main contract build by wrapping the contents of
src/exports/mod.rsin a macro you need to expand in a contract'slib.rs.