Request: List or exclude packages in try/except blocks (soft dependencies)

Packages imported in try/except blocks are often not really needed. Would be nice to be able to generate a list of such packages.

Start at pipreqs' import-scanning path and trace how imports inside try/except blocks are currently collected. Clarify whether the request is for a report, an exclusion option, or both, then add focused coverage for the chosen behavior and verify the generated requirements output.

Written by the indexing model from the issue text.