3597504: allow importing from a text file of DOI numbers

byronvealerequested to merge
issue/bibcite_crossref-3597504:3597504-allow-importing-from-doi-list into 2.0.x

3597504: allow importing from a text file of DOI numbers.

Used primarily Claude Opus 4.8 to code new feature to allow importing references from a text file of DOI numbers, modeled after the bibcite_pubmed module.

Closes #3597504

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