Aggregate "root" lookup failures #692
                
     Merged
            
            
          
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Fixes #635
These errors are common and are usually repeated several time. With this commit, they are merged into one message with only the necessary informations:
I initially tried to handle these errors while resolving imports but it was showing mangled names (eg.
Stdlib__bytes Stdlib__string ...instead ofStdlib) and unused modules (eg.CamlinternalFormatBasics) and decreased performances a bit.