ASIN-only imports from Amazon include inappropriate and duplicate sellers' items

As I understand it, Amazon assigns an ASIN to each item being sold; this does not have to be a single book nor does it have to be sets of books that were originally published as a set. I have recently noticed imports of seller-created bundles that are not appropriate for the OpenLibrary catalog. Such items should be excluded from imports if possible.

### Relevant url?
List: https://openlibrary.org/people/seabelis/lists/OL143669L/Bad_ASIN_imports

This looks like it is legitimately a set, but does it need to be represented as such in the catalog? I think records for the individual volumes is sufficient. In any case, it was imported from multiple sellers. https://openlibrary.org/works/OL20110771W

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### Proposal & Constraints

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### Stakeholders
@hornc

Start by reviewing the Bad_ASIN_imports list and the example work record linked in the issue, then locate the Amazon ASIN import entry point; no files or tests are named. Done should mean inappropriate seller-created bundles and duplicate seller items are excluded from imports, with tests documenting the chosen behavior.

Written by the indexing model from the issue text.